Answer:
velocity, v = 15m / 3.0s
= 5 ms^-1
velocity = wavelength × frequency
5 ms^-1 = 1.5m × f
f = 5 ms^-1 / 1.5 m
f = 3.33 Hz
f = 1/T
T = 1/f
= 1/ 3.33 Hz
= 0.3 s
frequency, f = 3.33 Hz
period, T = 0.3 s
. A car traveling at 30m/s is accelerated uniformly at the rate of 2.5m/s2for 6 sec. What is its final velocity?
Answer:
45m/s^1
Explanation:
v=u+at
v=(30)+(2.5)(6)
v=45m/s^1
An object with a mass of 5kg has a force of 20N applied to it. What is the resulting acceleration of the object?
Answer:
The answer is 4 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
where
f is the force
m is the mass
From the question
f = 20 N
m = 5 kg
We have
[tex]a = \frac{20}{5} \\ [/tex]
We have the final answer as
4 m/s²Hope this helps you
A boat covered 5/9 of a journey at an average speed of 25
mph. Then, it travelled the remaining 120 miles at another
speed. If the total time of the whole journey was 8.5 hours,
what was the amount of time the boat spent on the remaining
120 miles? (Write as a decimal.)
_____ hours
Need it for now
Answer:
Thus, the time for the remaining 120 miles: 8.5 - 6 = 2.5 h
Explanation:
The remaining 120 miles was (1 - 5/9 = 4/9) of the total journey.
Then, total distance: 120 ÷ 4/9 = 120 × 9/4 = 270 miles
The distance for 25 mph: 270 × 5/9 = 150 miles
The time for 25 mph: 150 ÷ 25 = 6 h
The boat spent 2.5 hours on the remaining 120 miles.
What is speed?Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.
According to the question, The remaining 120 miles was (1 - 5/9) = 4/9of the total journey.
Then, total distance travelled by the boat: 120 ÷ 4/9 = 120 × 9/4 = 270 miles.
The distance travelled by the boat at 25 mph: 270 × 5/9 = 150 miles.
The time taken to travel this distance: 150 ÷ 25 = 6 hours.
Hence, the time for the remaining 120 miles is: 8.5 - 6 = 2.5 hours.
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A model railroad train travels at a constant speed of 8 cm/s . How far would the train travel in one minute ?
Answer:
Answer:
480cm or 0.48m
Explanation:
Given parameter:
Speed of the train = 8cm/s
time of travel = 1minute
Unknown:
Distance traveled = ?
Solution:
Speed is the rate of change of distance with time. This suggests that mathematically;
Speed =
Distance covered = speed x time
Now to solve for the distance;
Convert the time to seconds;
60seconds = 1 minute
Distance covered = 8cm/s x 60s = 480cm
Distance covered is 480cm or 0.48m
An object has a mass of 10 kg and it is accelerating at a rate of 12 m/s2. What is the net force causing this acceleration?
100 N
O 120 N
0 140 N
O 160 N
Answer:
net force causing acceleration is 120N
Explanation:
Given parameters:
Mass of the object = 10kg
Acceleration = 12m/s²
Unknown:
Net force of this acceleration = ?
Solution:
According to newtons second law of motion;
Force = mass x acceleration
Sine the unknown is the net force, input the parameters and solve for it;
Force = 10 x 12 = 120N
The net force causing acceleration is 120N
4. Calculate the momentum for each scenario:
a. .02 kg mass moving at 300 m/s
b. 2 kg mass moving at 40 m/s
c. 200 kg mass moving at 4 m/s
a) Answer:
Momentum = 6 kgm/s
Explanation:
Momentum = mass × velocity
Given that,
mass = 0.02 kg velocity = 300 m/s
Therefore, momentum = (0.02 × 300)kgm/s
Momentum = 6 kgm/s
b) Answer:
Momentum =80 kgm/s
Explanation:
Momentum = mass × velocity
Given that,
mass = 2 kg velocity = 40 m/s
Therefore, momentum = (40 × 2)kgm/s
Momentum = 80 kgm/s
c) Answer:
Momentum = 800 kgm/s
Explanation:
Momentum = mass × velocity
Given that,
mass = 200 kg velocity = 4 m/s
Therefore, momentum = (200 × 4)kgm/s
Momentum =800 kgm/s
If an object starts accelerating from rest at a rate of 35 m/s2, then how far does it travel during the first second?
what is the distance from letter D to A?
Answer:
5 is a correct Answer iiiiiiiiiii
Newton's first law of motion is also called the law of
.
Answer:
The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. Newton's first law of motion is often stated as. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Explanation:
Answer:
Newton's first law is also called the law of Inertia.
Explanation:
What is inertia ?The property of a body by virtue of which it wants to remain in its position, is called inertia.
Mainly there ae three types of inertia-
Inertia of restInertia of motion Inertia of directionInertia was discovered by Galileo and it was modified by Newton.
What is Newton's first law of motion ?If a body is in motion or in rest, it wants to remain in its position unless any external force is applied.
Thus Newton's first law of motion is also called law of inertia.
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If all objects that have mass also have gravity, why doesn't your pencil get pulled towards you while it sits on your desk?
Answer:
The pencil is not pulled towards a person due to a very small magnitude of force between them, due to lighter masses.
Explanation:
Let us apply Newton's Law of Gravitation between a person and pencil.
Average Mass of a Normal Pencil = m₁ = 10 g = 0.01 kg
Average Mass of a Person = m₂ = 80 kg
Distance between both = r = 1 cm = 0.01 m (Taking minimal distance)
Gravitational Constant = G = 6.67 x 10⁻¹¹ N.m²/kg²
So,
F = Gm₁m₂/r²
F = (6.67 x 10⁻¹¹ N.m²/kg²)(0.01 kg)(80 kg)/(0.01 m)²
F = 5.34 x 10⁻⁷ N
This Force is very small in magnitude due to the light masses of both objects.
Therefore, the pencil is not pulled towards a person due to a very small magnitude of force between them, due to lighter masses.
On the Moon, astronauts can “bounce” from location to location, but on Earth they cannot move in this way. What physical property changes based on the gravitational force of a planet or moon?
An object is accelerating if there is a change in speed and which factor? A. direction B. displacement C. time D. position
Answer:
time bc speed uses time
Explanation:
hope it helps♡ ;)
An object is accelerating if there is a change in speed and there is a change in direction, therefore the correct answer is option A.
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².
Even if the magnitude of the velocity not changing even the change in the direction would lead to acceleration,
uniform circular motion is one of the best examples where the speed is constant but the direction is changing continuously
Thus, An object is accelerating if there is a change in speed and there is a change in direction, therefore the correct answer is option A.
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Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.
A purple center outlined in black with two concentric black circles around the center, the inner circle having 2 small green balls on it and the outer circle having 8 small green balls on it.
What experimental evidence led scientists to change from the previous model to this one?
A few of the positive particles aimed at a gold foil seemed to bounce back.
The colors of light emitted from heated atoms had very specific energies.
Experiments with water vapor showed that elements combine in specific proportions.
Cathode rays were bent in the same way whenever a magnet was brought near them.
Answer:
B: The colors of light emitted from heated atoms had very specific energies.
Explanation:
In Thompson's model of an atom the atom is said to be constituted of electrons which are surrounded by a haze of positive charge in order to balance the electrons' negative charges. It is also called plum prodding model because of negatively charged plums which are surrounded by the positively charged pudding.
Now, as the electrons move from higher to lower energy levels a photon which is a particle of light will be given off.
Thus, the correct answer is option B
Answer:
B: The colors of light emitted from heated atoms had very specific energies.
Explanation:
What is the kinetic Energy of the 80 kg skydiver if he is falling at 60 m/sec?
Answer:
144000J
Explanation:
Ek=1/2mv²
Ek=1/2×80×60²
Ek=144000J
which one of the following is a derived Si unit a. Newton, b. Meter, c. Mole, d. Kiogram
Answer:
The SI is founded on seven SI base units for seven base quantities assumed to ... The SI derived units for these derived quantities are obtained from these ... mass density, kilogram per cubic meter, kg/m3 ... amount-of-substance concentration, mole per cubic meter, mol/m3 ... solid angle, steradian (a), sr (c), -, m2·m-2 = 1 (b).
Kilogram is a derived SI unit of the following.
Thus, A universal standard for expressing the magnitudes or quantities of significant natural events is the International System of Units.
The acronym SI, which derives from the French term Systèm international stands for the System of Units, also known as the metric system. The meter-kilogram-second (MKS) system, an earlier unit of measurement, serves as the foundation for the SI standard.
The SI standard is promoted and explained by the Bureau international des poids et mesures (BIPM). The organization was founded in 1875 and is known as the International Bureau of Weights and Measures in English. It is governed by the International Committee for Weights and Measures (CIPM).
Thus, Kilogram is a derived SI unit of the following.
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The town of Seaside needs to build a new power plant. The old coal burning plant produces too much pollution and is no longer safe. The mayor decides that he will do some research on alternative forms of energy like nuclear power plants and solar power plants.
What types of resources should the mayor use to conduct his research? Why would these be considered reliable sources of information and why? What types of resources are reliable? How can he use what he learns to make the best decision for the town?
The mayor is making a good decision to do research into renewable forms of energy. Not only does coal produce pollution, it also contributes to greenhouse gas emissions. Plus, the supply of coal is a finite source. It is considered a natural resource instead of renewable. That means that eventually the supply of coal will run out at some point. Renewables do not encounter such a problem.
So it's smart to look into alternative forms of energy such as nuclear or solar. The benefit of nuclear is that it produces a lot of energy and does so efficiently. The downside is that it's that accidents would lead to disastrous outcomes (eg: the nuclear disaster in Japan). Also, there's the issue of what to do with the nuclear waste. The waste itself is very dangerous and it must be buried underground sealed in thick containers. This is an expensive operation. The rate of decay of the material takes a long time, which means that future generations hundreds of years down the line will have to deal with the waste.
Solar is a cleaner alternative to nuclear, but unfortunately it is not as efficient compared to nuclear power. You need a lot of solar panels in a vast open area to be able to get the energy to power many homes. Places out in the desert are a good choice to put the solar farms because the sun shines intensely there and not many people (or no people) live out in remote areas such as that one.
Because the town is called Seaside, it seems like this town is on the coast. If so, then the mayor should look into wind power to complement solar power. Wind along the coast is often very intense due to the sea current and jet stream. The downside to wind power is that some days the wind doesn't blow at all. The mayor could also look into tidal power which harnesses the flow of the tides coming in and out. If a major river is nearby (that flows into the ocean) then s/he could consider hydroelectric power as well. There are many renewable options to pick from. Each option has its pros and cons, so it's up to the mayor to weigh what exactly their needs are and how efficiently they want electricity. Mixing various options is possibly the best idea since you get a bit of each pro/con from all the options mentioned.
A 10 kg box is resting on the table. What is the normal force on the box?
Answer:
normal force and gravitational force are equal. change kg to newtons
98N
Explanation:
The normal force on the box resting on the table is 98 N.
The given parameters;
mass of the box, m = 10 kgThe normal force on the box resting on the table is the force acting perpendicular to the box and it is calculated as follows;
Fₙ = mg
where;
m is the mass of the boxg is the acceleration the to gravityFₙ = 10 x 9.8
Fₙ = 98 N
Thus, the normal force on the box resting on the table is 98 N.
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5. Michael wanted to see what kitchen cleaner worked best for cleaning her counters. He used Lysol, Clorox, Pine-sol, and just water. For each cleaner, he put 5 milliliters of grape juice on the counter, sprayed the cleaner, and wiped it with one paper towel.
Answer:
Michael wanted to see what kitchen cleaner worked best for cleaning his counters. He used Lysol, Clorox, Pine-Sol, and water. For each cleaner, he used 5 milliliters of grape juice on the counter, sprayed the cleaner, and wiped it with one paper towel. Which of the following would be a constant?
answer choices:
-Lysol
-Cleaning products
-5 milliliters of grape juice
-Cleanest countertop recorded
5 milliliters of grape juice will be constant.
Explanation:
The different cleaning agents have different cleaning capabilities and some will require more of its quantity than others to clean the counter.
Secondly, only the grape juice has a measured amount of 5 milliliters
Select the correct answer from each drop-down menu.
Brenda is a crime scene investigator. She believes there is blood at the scene of the crime but needs to confirm her initial findings. Which of the
following techniques should she use to find probable evidence of blood and confirm that it is indeed blood?
Brenda should uses a
to confirm that it is indeed blood.
test to find probable evidence of blood. If she does so, she should use a
✓ test
Answer:
it is kastle Meyer fasure
A group of tourists drives through a state park in Maine. While arguing about whether the animal they've just seen is an Elk or a Moose, a chipmunk darts across the park road. The driver, who was traveling 6.7 m/s through the park slams on their breaks and comes to a stop. If the car has an acceleration of -8.3 m/s2, how long does it take the car to stop?
Answer:
0.8 second
Explanation:
Given data
Speed v=6.7m/s
Deceleration = - 8.3m/s²
Initial velocity u= 0m/s
We can solve for the distance covered upon breaking the speed using the expression
v=u +at
6.7=0-(8.3)t
6.7=8.3t
Divide both sides by 8.3
6.7/8.3=t
t=6.7/8.3
t=0.8 second
How does a neutral atom change when its number of protons, electrons, or neutrons changes?
Answer:
A change in protons changes the element identity. A change in neutrons changes the element's atomic weight, but does not change the identity. More protons than electrons is a positive charge, more electrons than protons is a negative charge.
Explanation:
Which of the following is NOT a vector?
A. Force
B. Acceleration
C. Mass
D. Displacement
Answer:
Explanation:
Mass is the only one of these that is not vector; everything else has both magnitude and direction.
If a car accelerates at a uniform 4.0 m/s, how long will it take to reach a speed of 36.0 m/s,
starting from rest?
Answer:
9s
Explanation:
v=u+at
36=0+4t
t=36-0/4
t=9s
A 250 kg cannon containing a cannonball is initially at rest. If the cannon shoots the 20 kg cannonball at 15 m/s, what is the magnitude of the recoil velocity of the cannon?
Answer:
hhgyujhkhgjghhjhhghjkhlhjkghghgh
Explanation:
Why can’t you use a model to learn everything about an object?
Answer:Models have always been important in science and continue to be used to test hypotheses and predict information. Often they are not accurate because the scientists may not have all the data. It is important that scientists test their models and be willing to improve them as new data comes to light.
Explanation:
Answer:
Models have always been important in science and continue to be used to test hypotheses and predict information. Often they are not accurate because the scientists may not have all the data. It is important that scientists test their models and be willing to improve them as new data comes to light.
Explanation:
Find the mass if the force is 18 N and the acceleration is 2 m/s2.
Answer:
The answer is 9 kgExplanation:
To find the mass given the force and acceleration we use the formula
[tex]m = \frac{f}{a} \\ [/tex]
where
f is the force
a is the acceleration
We have
f = 18 N
a = 2 m/s²
We have
[tex]m = \frac{18}{2} \\ [/tex]
We have the final answer as
9 kgHope this helps you
How do I shift reality?
Answer:
i think you should probably join shifting aminos/discord servers. i would tell you how but it wont fit here :((
Explanation:
Answer:
Shimmey shay on yt
Explanation:
Lucy and JoJo need to make 140 cupcakes for the school dance. Lucy made 35 of the cupcakes. JoJo made 42 cupcakes What fraction of the cupcakes do Lucy and JoJo still need to make?
Answer:
9/20
Explanation:
According to this question, Lucy and JoJo need to make 140 cupcakes for the school dance. Lucy made 35 of the cupcakes while JoJo made 42 cupcakes. This means that in total, (42 + 35) cupcakes has been made by both Lucy and JoJo
That is, 77 cupcakes out of 140 has been made. This is 77/140 i.e. 11/20
Since 77/140 cupcakes has been made, Lucy and JoJo still need to make;
140 - 77 = 63 cupcakes to meet up their target for the school dance.
This means that the fraction left is 63/140
63/140 in its lowest term is 9/20
Hence, 9/20 of the cupcakes still need to be made by Lucy and JoJo.
Explanation: 140 - 35 = 105 - 42 = 63
yare yare daze
I use tusk act 4 main
A car travels at a constant speed of 70 km/hr for 15 minutes. The car decreases its speed from 70 to 40 km/hr over the next two minutes and then continues to travel at a constant speed of 40 km/hr for the next 5 minutes Which of the following graphs best represents the car's motion during the given time period?
Answer:
A car travels at a constanT
Two ropes are attached a wagon one horizontal to the west with a tension force of 75N and other east and at an angle of 38 degrees upward from horizontal with a lension force of 125 N Find the components of the net force on the cart Show your work
Answer:
The components of the net force acting on the cart are;
Horizontal force, Fₓ ≈ 23.5 N acting east
The vertical force, [tex]F_y[/tex] ≈ 76.96 N
Explanation:
The parameters given in the question are;
The magnitude of the force on the rope acting horizontally to the west = 75 N
The magnitude of the force on the other rope east acting at an angle to the horizontal = 125 N
The angle to the horizontal of the force on the other rope east to the horizontal = 38°
Therefore, we have;
The horizontal component of the force acting east = 125 × cos(38°) ≈ 98.5 N
The net sum of the horizontal forces, ∑Fₓ noting that the horizontal forces are acting in opposite direction is given as follows;
∑Fₓ = 75 - 125 × cos(38°) = 75 - 98.3 = -23.5N
Given that the difference in forces is negative, and hat we took the force acting east as negative, we have that the net horizontal force is acting east with a horizontal component of 23.5N
The net vertical force, ∑F[tex]_y[/tex], is given as follows;
∑F[tex]_y[/tex] = 125 × sin(38°) ≈ 76.96 N
Therefore, the components of the net force acting on the cart are;
Horizontal force, Fₓ ≈ 23.5 N, the vertical force, [tex]F_y[/tex] ≈ 76.96 N
The components of the net force on the cart are 23.5 Newton and 76.96 Newton.
Given the following data:
Tension force (horizontal) due west = 75 NTension force (horizontal) due east = 125 NAngle of inclination = 38°To find the components of the net force on the cart:
First of all, we would determine the horizontal component of the force acting due east.
[tex]F_y = Fcos(\theta)\\\\F_y = 125cos(38)\\\\F_y = 125 \times 0.7880\\\\F_y = 98.5 \; Newton[/tex]
Next, we would find the resultant horizontal forces:
[tex]\sum F_y = F + F_y\\\\\sum F_y = 75 + (- 98.5)\\\\\sum F_y = -23.5 \;Newton[/tex]
Therefore, the horizontal component of the net force acts in the opposite direction due east.
Horizontal component of the net force = 23.5 Newton
For the vertical component of the net force:
[tex]\sum F_x = Fsin(\theta)\\\\\sum F_x = 125cos(38)\\\\ \sum F_x = 125 \times 0.6157\\\\ \sum F_x = 76.96\; Newton[/tex]
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