Answer:
-v/2
Explanation:
Given that:
- Collides with the wall going through a sliding motion on on the plane smooth surface.
- Upon rebounding from the wall its kinetic energy becomes one-fourth of the initial kinetic energy before collision.
<u>We know, kinetic energy is given as:</u>
consider this to be the initial kinetic energy of the body.
<u>Now after collision:</u>
Considering that the mass of the body remains constant before and after collision.
Therefore the velocity of the body after collision will become half of the initial velocity but its direction is also reversed which can be denoted by a negative sign.
Answer:
<h2>The answer is option C</h2>
Explanation:
The work done by an object given it's distance and force can be found by using the formula
<h3>work done = force × distance</h3>
From the question
force = 20 N
distance = 10 m
The work done is
work done = 20 × 10
We have the final answer as
<h3>200 J</h3>
Hope this helps you
Answer:
Wegener proposed his theory of "continental drift." Wegener proposed that the continents plowed through crust of ocean basins, which would explain why the outlines
Answer: Either it's B. The seismic waves frequency also changed multiple times.
or
D. As the wave passed through less dense material, the speed of the wave increased.
Explanation: I'll let you choose because I'm stumped on which one it is. They both sound like they would fit perfectly with the question and I've tried doing research on it but nothing can prove either one right or wrong for me.
I know seismic waves can change frequency given the density of rock\ground it's going through.
"The propagation velocity of seismic waves depends on density and elasticity of the medium as well as the type of wave. Velocity tends to increase with depth through Earth's crust and mantle, but drops sharply going from the mantle to outer core."
However, B. also fits nicely.
"Temperature tends to lower the speed of seismic waves and pressure tends to increase the speed. Pressure increases with depth in Earth because the weight of the rocks above gets larger with increasing depth."
Nevertheless, I hope it helps.
Answer:
David will drive a total of 7 hours and 15 minutes to see his grandma.
Explanation:
To solve this problem, it is easiest to set up a dimensional analysis problem that allows us to multiply and cancel units. This is shown below.
435 miles * 1 hour/60 miles
Since miles appears both in the numerator and denominator, we know that this unit will cancel, so our answer will be in units of hours.
435/60 = 7.25 hours
This means that David's trip will take 7.25 hours. However, the question asks for the time David will travel in hours and minutes, so we must convert this answer into those units.
We can keep the number 7 because it represents the number of full hours David will drive, but we must convert 0.25 hours into minutes. Since there are 60 minutes in 1 hour, we can multiply 0.25 * 60 to find out how many minutes David will drive.
0.25 * 60 = 15
Therefore, David will drive a total of 7 hours and 15 minutes to see his grandma.
Hope this helps!