Answer:
Explanation:
1 ) Force F = dp/ dt , p is momentum
= d/dt (mv)
= v dm/dt
Given dm/dt = 0.1 kg per second.
Force = v x 0.1
= .1 x .1
= .01 N
2 ) work done = force x displacement
Displacement in 1 s = 0. 1 m ( v = .1 m /s )
Work done in one second = .1 X .1
= .01 J
3 ) Velocity is constant so change in kinetic energy is due to additional mass .
Mass deposited in one second
= .1 g
Velocity = .1 m/s
Change in kinetic energy = 1/2 x .1 x .1 ²
= 5 x 10⁻⁴J
4 ) No , they are not the same. It is so because force has to do work against the frictional force offered by the surface on which sand is falling . So rise in kinetic energy is small as compared with work done by the force.
Answer:
Find the attachments for complete solution
Answer
given,
angular speed of the tub = 5 rev/s
time = 9 s
he tub slows to rest = 15.0 s
the angular acceleration
angular displacement
case 2
now,
time = 15 s
the angular acceleration
angular displacement
total revolution in 24 s
= 23 + 38
= 62 revolution
<span>2.56 sec (t=1/0.39)
f=3.9/10</span>
Answer:
STATIC, STATIC
KINETIC friction is less than static friction
Explanation:
In this exercise you are asked to complete the sentences with the correct words.
STATIC friction prevents the relative movement of two surfaces in contact.
For moving surfaces the friction is STATIC is greater than the kinetic friction.
For the last two sentences I think they are misspelled, the correct thing is
KINETIC friction is less than static friction