1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vaselesa [24]
2 years ago
8

An astronaut drops a rock from the top of a crater on the moon. When the rock is halfway down to the bottom of the crater, its s

peed is what fraction of its final impact speed?
Physics
2 answers:
Alexxx [7]2 years ago
8 0

Answer: vf1/vf2= 1/ sqrt(2)

Explanation :on the moon no drag force so we have only the  force of gravity. aceleration is g(moon)= 1.62m/s2.the rest is basic kinematics

if the rock travels H to the bottom we can calculate velocity:

vo=0m/s (drops the rock)  , yo=0

vf*vf= vo*vo+2g(y-yo)

when the rock is halfway  y = H/2 so:

vf1*vf1=2*g*H/2 so vf1 = sqrt(gH)

when the rock reach the bottom y=H so:

vf2*vf2=2*g*H so vf2 = sqrt(2gH)

so vf1/vf2= 1/ sqrt(2)

good luck from colombia

Margarita [4]2 years ago
4 0

Answer:1/√2

Explanation:

the rock has lost half of its gravitational potential energy, its kinetic energy at the halfway point is half of its kinetic energy at impact. Since K.E is proportional to v^2, if K.E at halfway point is equal to 1/2 x K.E,

Then,

The K.E at impact, then the rock’s speed at the halfway point

its speed at impact will be 1/√2 its impact speed

You might be interested in
Which term is most applicable to a discussion of angular momentum in the context of black holes?
seropon [69]

Answer:

Curvature

Explanation:

5 0
2 years ago
Electrically neutral objects become___when they or lose electrons.
madam [21]
If they lose an electron, that means they become more positive since an electron is negatively charged. So the answer is ‘positive’
7 0
3 years ago
Read 2 more answers
You must record your daily workouts on a
larisa [96]

I do a yoga mat that could be different to your answer

5 0
2 years ago
Read 2 more answers
A cannon ball is shot straight upward with a velocity of 72.50 m/s. How high is the cannon ball above the ground 3.30 seconds af
disa [49]

Answer:

Explanation:

Given

Cannon is fired with a velocity of u=72.50\ m/s

Using Equation of motion

y=ut+\frac{1}{2}at^2

where

y=displacement

u=initial\ velocity

a=acceleration

t=time

after time t=3.3 s

y=72.50\times 3.3-\frac{1}{2}\times 9.8\times (3.3)^2

y=239.25-53.36

y=185.89\ m

So after 3.3 s cannon ball is at a height of 185.89 m

6 0
3 years ago
Give 1 real life example of a scenario that takes advantage of the inverse relationship between force and time when impulse is c
OverLord2011 [107]

Answer:

On real life example of a scenario that takes advantage of the inverse relationship between force and time when impulse is constant is when making a serve with a lawn tennis racket

How It is an example of impulse is that when a serve is made by moving the bat slowly, the lawn tennis player uses less force and the ball is in contact with the string for longer a period

When however, the lawn tennis player moves the racket faster, with the strings of the racket highly tensioned  he uses more force and the ball also spends less time on the racket to produce the same momentum

Explanation:

The impulse of a force, ΔP is given by the following formula;

ΔP = F × Δt

Where ΔP is constant, we have;

F ∝ 1/Δt

Therefore, for the same impulse, when the force is increased, the time of contact is decreases and vice versa.

7 0
3 years ago
Other questions:
  • In which of the following situations does gravity supply a centripetal force?
    15·1 answer
  • State the average value of acceleration due to gravity
    8·1 answer
  • If you lift one load up two stories, how much work do you do compared to lifting one load up only one story?
    11·1 answer
  • Tim puts his spare change in a jar each day when he comes home. When the jar is full he separates the coins and takes them to th
    15·1 answer
  • What effect does time have on the speed of a moving object
    14·1 answer
  • How much work can be extracted from 5.00 × 10^4 J of heat when 2.00 × 10^4 J of heat is exhausted? A. - 7.00 × 10^4 J B. - 3.00
    15·1 answer
  • The amount of light a star gives off is called its.....
    5·1 answer
  • Question 8 of 10
    13·1 answer
  • The international space station (ISS) orbits the earth with a velocity 7.6 km/s. How much energy is required to lift a payload o
    13·1 answer
  • What causes hot spot volcanoes to form?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!