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
Mnenie [13.5K]
3 years ago
10

A 30 g bullet moving a horizontal velocity of 500 m/s comes to a stop 12 cm within a solid wall. (a) what is the change in the b

ullet's mechanical energy? (b) what is the magnitude of the average force from the wall stopping it?
Physics
1 answer:
Sidana [21]3 years ago
7 0
M = 30 g = 0.03 kg, the mass of the bullet
v = 500 m/s, the velocity of the bullet

By definition, the KE (kinetic energy) of the bullet is
KE = (1/2)*m*v²
      = 0.5*(0.03 kg)*(500 m/s)² = 3750 J
Because the bullet comes to rest, the change in mechanical energy is 3750 J.

The work done by the wall to stop the bullet in 12 cm is
W = (1/2)*(F N)*(0.12 m) = 0.06F J

If energy losses in the form of heat or sound waves are ignored, then
W = KE.
That is,
0.06F = 3750
F = 62500 N = 62.5 kN

Answer:
(a) 3750 J
(b) 62.5 kN

You might be interested in
Which statement is correct? (2 points) Select one:
Olin [163]
<span>The correct answer is B - Light can travel in a vacuum, and its speed is constant if the source is moving or stationary.</span>
7 0
3 years ago
Red fox
Svetach [21]
In a food pyramid, the organism that has the least amount of total energy available is the one that is in the bottom or last. In this case, given the list of organisms above, the organism that would have the least amount of total energy available would be the RED FOX. The answer is option A. Hope this answer helps.
6 0
3 years ago
Read 2 more answers
Which shows the formula for converting from degrees Celsius to degrees Fahrenheit?
LenKa [72]
Its simple, you have to plot in an example, but dont get confused with K, the answer its b

4 0
3 years ago
Read 2 more answers
An element's atomic number is 71. How many protons would an atom of this element have?
vovikov84 [41]

The atom has 71 protons.

(The atomic number of a chemical element is the number of protons found in the nucleus of an atom)

hope this helps

3 0
3 years ago
A climber pulls down on a rope causing his body to rise up with the rope? Which law of motion is it?
12345 [234]
This would be called the law of action-reaction. This states that every action will have an equal and opposite reaction. The action in the example is pulling down on the rope. The opposite and equal reaction is the climers body moving upward. The same law can be applied to a rocket. The action is the engines pushing down and the reaction is the rocket going up. :D
4 0
3 years ago
Other questions:
  • A cylinder of radius R, length L, and mass M is released from rest on a slope inclined at angle θ. It is oriented to roll straig
    13·2 answers
  • A rectangular wooden block measures 10.0cm x 4.00cm x 2.00cm. when the block is placed in water, it floats horizontally, with it
    12·1 answer
  • A 2.5 kg steel gasoline tank can holds 20.0 L of gasoline when full. What is the average density (in Kg/m^3) of the full gas can
    15·1 answer
  • 1. a) What is the weight of a 20.0 kg girl on earth?
    15·1 answer
  • Consider three scenarios in which a particular box moves downward under the pull of gravity :
    8·1 answer
  • To get better acceleration, you want to reduce the inertia of your bicycle. You have your choice of spending $45 on only one of
    13·1 answer
  • We run a distance of 1000 m at a speed of 4.3 m/s. Calculate the time elapsed to cover this distance
    5·1 answer
  • You observe that a mass suspended by a spring takes 0.25 s to make a full oscillation. What is the frequency of this oscillation
    6·1 answer
  • A couple is sitting side-by-side. By what factor should the distance between them be changed by if the attractive force is to be
    14·1 answer
  • The sound wave passes from the sea-water into the air. State what happens to; the speed of the waves
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!