Saturday
April 19, 2014

Homework Help: physics-speed

Posted by Damon on Tuesday, August 7, 2007 at 12:05am.

i need help with this one
thanks

A particle starts from rest and is acted on by a net force that does work at a rate that is proportional to the time t. The speed of the particle is proportional to:

a. sq. root t
b. t
c. t^2
d.1/sq. root t
e. 1/t



Work done is proportional to the integral of a constant times t. That means the work done is proportional to t^2. It will equal the final kinetic energy, which is proportional to v^2. Therefore v^2 is proportional to t^2, and v must be proportional to t.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Physics - A particle of mass 5 kg is acted upon by a horizontal force of ...
Mechanics - A particle of mass 5 kg is acted upon by a horizontal force of ...
PHYSICS - 3. A particle of mass m= 5.00 kg is released from point A(at rest) ...
physics - A person is riding on a Ferris wheel of radius R. He starts at the ...
physics help - The magnitude of the velocity of a particle which starts from ...
physics help - The magnitude of the velocity of a particle which starts from ...
Physics - A race car starts from rest in the pit area and accelerates at a ...
physics - A particle accelerates from rest at 3.1 m/s2. What is its speed 5.5 s ...
General Physics I - A 50-N force acts on a 2-kg crate that starts from rest. ...
Physics - Could you please check my answers and help me out with the last two? ...

Search
Members