A hand exerts a constant horizontal force as a block that is free to slide on a

Question

A hand exerts a constant horizontal force as a block that is free to slide on a fr from rest a point A, and by the time is has traveled a distance d to point B it is t ictionless surface. The block start aveling with speed v. When the block has traveled another distance d to point C, will ts s peed be greater d to point C, will its speed be greater than, less than, or equal to 2v? a. Greater b. Equal c. Less 24. To tighten a bolt, you push with a force of 80 N at the end of wrench handle that is 0.25 m from the axis of the bolt. (a) what torque are you exerting. (b) You move your hand inward to be only 0.10 m from the bolt. What is the torque you need to exert? (a) 15 Nm (b) 20 N (c) 27 N (d) 33 Nm (e) 40 N n (a) 100 N (b) 150 N (c) 200 N (d) 250 N (e) 300 NA weigh about the same on Earth and are equally strong. The first astronaut throws the second one toward he third one and the game begins. What is the motion of the astronauts as the game proceeds. How long will the 25. Suppose that there are three astronauts outside a spaceship and they decide to play catch. All the astronauts game last? a. 1 toss b. 2 tosses c. 3 tosses d. 100 tosses e. An infinite number of tosses or until they get tired

Explanation / Answer

23)

Since constant force is acting

The acceleration will be constant

for 1st d distance:

vi = 0

vf = v

use:

vf^2 = vi^2 + 2*a*d

v^2 = 2*a*d

This is initial velocity for next d distance:

vi = v

vf=?

usE:

vf^2 = vi^2 + 2*a*d

vf^2 = 2*a*d + 2*a*d

vf^2 = 4*a*d

vf^2 = 2*v^2

vf = sqrt(2)*v

vf = 1.4142*v

It is less than 2 v

Answer: c.Less

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