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
UNO [17]
2 years ago
8

In which situation is no work being done?

Physics
1 answer:
soldi70 [24.7K]2 years ago
4 0

Answer:

Explanation:

A: as long as the height does not change, there is no work being done going from 1 place to the next.

B: Here's where the work is being done for A. You lift the box from ground level to the height where it settles.

C: If there is friction involved (and it sounds like there is) then there is work being done against the friction.

D: same explanation as C.

You might be interested in
A 12.0-g bullet is fired horizontally into a 109-g wooden block that is initially at rest on a frictionless horizontal surface a
kykrilka [37]

Answer:

v₀ = 280.6 m / s

Explanation:

we have the shock between the bullet and the block that we can work with at the moment and another part where the assembly (bullet + block) compresses a spring, which we can work with mechanical energy,

We write the mechanical energy when the shock has passed the bodies

   Em₀ = K = ½ (m + M) v²

We write the mechanical energy when the spring is in maximum compression

Em_{f} = K_{e} \\= \frac{1}{2} kx^2\\    Em_0 = Em_{f}

½ (m + M) v² = ½ k x²

Let's calculate the system speed

   v = √ [k x² / (m + M)]

   v = √[152 ×0.78² / (0.012 +0.109) ]

   v = 27.65 m / s

This is the speed of the bullet + Block system

Now let's use the moment to solve the shock

Before the crash

   p₀ = m v₀

After the crash

p_{f} = (m + M) v

The system is formed by the bullet and block assembly, so the forces during the crash are internal and the moment is preserved

 p_0 =  p_{f}

  m v₀ = (m + M) v

  v₀ = v (m + M) / m

let's calculate

v₀ = 27.83 (0.012 +0.109) /0.012

  v₀ = 280.6 m / s

4 0
2 years ago
Because so little can be found of the first rocks to form on
fgiga [73]

Answer:

B is the answer

Explanation:

0-/-<

7 0
3 years ago
A cylindrical shell of radius 7.00 cm and length 2.21 m has its charge uniformly distributed on its curved surface. The magnitud
polet [3.4K]

Answer:

The net charge on the shell is 30x10^-9C

Explanation:

Pls see attached file

8 0
3 years ago
Find the mass of a copper block with heat capacity 50j/kg,(specific heat capacity of copper=400j/kg)​
kirza4 [7]

−1
C
−1
and L
f
​
=3.5×10
5
Jkg
−1

Mass of copper block m=2kg
Heat released by the copper block is equal to the heat gained by the ice to melt.
Let the mass of the ice melted be M.
Change in temperature of copper block ΔT=500−0=500
o
C
∴ mS(ΔT)=ML
f
​

Or 2×400×500=M×3.5×10
5

⟹ M=1.14kg
3 0
2 years ago
Read 2 more answers
two asteroids crashed the crash caused both asteroids to change speeds scientist want to use the change
11Alexandr11 [23.1K]

Answer:

The force each one experienced

Explanation:

Hope this helps :)

3 0
2 years ago
Other questions:
  • A mass is tied to a string and swung in a horizontal circle with a constant angular speed. show answer No Attempt If this speed
    11·1 answer
  • A cannon fires a cannonball 500.0 m downrange when set at a 45.0o angle. At what velocity does the cannonball leave the cannon?
    5·1 answer
  • Two Earth satellites, A and B, each of mass m, are to be launched into circular orbits about Earth’s center. Satellite A is to o
    9·1 answer
  • A railroad car of mass M moving at a speed v1 collides and couples with two coupled railroad cars, each of the same mass M and m
    15·1 answer
  • Two UFPD are patrolling the campus on foot. To cover more ground, they split up and begin walking in different directions. Offic
    14·1 answer
  • The earth's magnetic fleld extends:
    12·2 answers
  • As the solar system cooled and developed, larger bodies were pushed away from its center by gravity.
    8·2 answers
  • Energy that travels in waves through matter
    5·1 answer
  • EASY BRAINLIEST PLEASE HELP!!
    14·2 answers
  • How can we use radioactive sources?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!