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
Bess [88]
3 years ago
7

A hand pushes two blocks, A and B, along a frictionless table for a distance d. When the hand starts to push, the blocks are mov

ing with a speed of 2 m/s. Suppose that the work done on block A by the hand during a given displacement is 10 J. Determine the final energy of each block. Mass of A is 4kg, mass of B is 1kg.
Physics
1 answer:
Kitty [74]3 years ago
5 0
  <span>net work = change in kinetic energy 

for Block B, we just have the force from block A acting on it 
F(ab)d= .5(1)vf² - .5(1)(2²) 
F(ab)d= .5vf² - 2 

Block A, we have the force from the hand going in one direction and the force of block B on A going the opposite direction 

10-F(ba)d = .5(4)vf² - .5(4)(2²) 
10-F(ba)d = 2vf² - 8 
F(ba)d = 18 - 2vf² 

now we have two equations: 
F(ba)d = 18 - 2vf² 
F(ab)d= .5vf² - 2 

since the magnitude of F(ba) and F(ab) is the same, substitute and find vf (I already took into account the direction when solving for F(ab) 

10-.5vf² + 2 = 2vf² - 8 
12 - .5vf² = 2vf² - 8 
20 = 2.5vf² 
vf² = 8 

they both will have the same velocity 
KE of block A= .5(4)(2.828²) = 16 J 
KE of block B=.5(1)(2.828²) = 4 J</span>
You might be interested in
In one type of solar energy system, sunlight heats the air within solar panels, which heats copper tubes filled with water. What
Anna71 [15]
The type of energy that is produced by the system that is described is heat energy. The correct answer is D. 
3 0
3 years ago
Read 2 more answers
Most earthquakes happen:
umka2103 [35]

Along plate edges, at points where oceanic or continental plates meet ot at the edges of the plates

4 0
3 years ago
Read 2 more answers
The size (radius) of an oxygen molecule is about 2.0 ×10−10 m. Make a rough estimate of the pressure at which the finite volume
timurjin [86]

Answer:

P = 1 x 10⁸ Pa

Explanation:

given,

radius = 2.0 ×10⁻¹⁰ m

Temperature

T = 300 K

Volume of gas molecule =

V = \dfrac{4}{3}\pi r^3

V = \dfrac{4}{3}\pi (2\times 10^{-10})^3

 V = 33.51 x 10⁻³⁰ m³

we know,

P  V = 1 . k T

k = 1.38  x 10⁻²³ J/K

P(33.51 x 10⁻³⁰) = 1 . (1.38  x 10⁻²³) x 300

P = 1.235 x 10⁸ Pa

for 1 significant figure

P = 1 x 10⁸ Pa

6 0
3 years ago
Every object in the universe exerts a force on every other object. This force is called
MrMuchimi

Gravity is the correct answer.

6 0
3 years ago
Compare and contrast the two different types of mechanical waves?
prohojiy [21]
There are longitudinal and transverse.  Both types of mechanical waves require a medium, transport energy, and have defined wavelengths, frequencies, and speeds.
Differences are that transverse waves oscillate along a direction perpendicular to the direction of travel (like shaking a rope up and down).  Longitudinal waves like oscillations along a spring and sound waves, oscillate back and forth along the direction of travel. 
5 0
3 years ago
Other questions:
  • Two students push a heavy crate across the floor. John pushes with a force of 185 N due east and Joan pushes with a force of 165
    14·1 answer
  • What does the principle of the constancy of lightspeed tell us about the speed of light?
    8·1 answer
  • The gravitational force between two asteroids is 1,000,000 n. what will the force be if the distance between the asteroids is do
    13·1 answer
  • What is the source of the energy released in fission and fusion reactions?
    13·2 answers
  • From the top of the engineering building, you throw a ball vertically upward. the ball strikes the ground 4.00 s later. the engi
    12·2 answers
  • How to find wavelength
    10·1 answer
  • What should you do if you see lightning while you are outside exercising? Head inside Stay under a tree Lie in the grass Move qu
    11·2 answers
  • A 1500 kg car drives around a flat, 50 m diameter track, starting from rest. The drive wheels supply a small but steady 525 N fo
    15·1 answer
  • The velocity of a particle is given by v=20t² - 100t + 50, where v is in meters per second and t is in seconds. Evaluate the vel
    13·2 answers
  • Can someone please help me?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!