# physics mc question!!!!HELP

posted by .

Question # 1 : It a particle increases its speed by a factor of 2, what happens to the kinetic energy?
a)doubles
b)cuts in half
c)increases by a factor of 4
d)depends on whether or not work is done on the particle

Question # 2: An object falling near the surface of the Earth
a)decreases its potential energy due to gravity
b)has positive work done on it by gravity
c)both a and b
d)either a or b, depending on whether or not the Earth and the object or just the object are the system.

• physics mc question!!!!HELP -

compare (1/2) m v^2 to (1/2) m (2 v)^2

the second is 4 times the first

==================
a) is correct
b) is correct
so c)

## Similar Questions

1. ### Physics Help!!!! Please check

We had worked this one out before but due to my bad note i really don't understand what is going on in the question. Following the question I will post what I wrote done. Please help me make some sense of it. A 3.2 kg block is hanging …
2. ### physics kinetic energy

a) if a particle's speed decreases by a factor of four, by what factor does its kinetic energy change?
3. ### College Physics

If the voltage across an ohmic resistor is quadrupled, the power expended in the resistor increases by a factor of 4. decreases by a factor of 4. increases by a factor of 16. none of the preceding
4. ### physics

true or false 1. The work required to stretch a spring changes linearly with the amount of strech?
5. ### Physics 2

A particle moves along a line where the potential energy of its system depends on its position r as graphed in Figure P8.46. In the limit as r increases without bound, U(r) approaches +1 J. (a) Identify each equilibrium position for …
6. ### physics

A particle has a kinetic energy equal to its rest energy. (a) What is the speed of this particle?
7. ### mc questions

Question # 1-What is the magnitude of the momentum of a particle of mass 2 kg with a speed of 5 m/s?
8. ### Physics

Question: particle J with zero initial mass and X energy accelerates from a static start to 'C' (light speed) in a time frame of N and mass increases 10 to the 28th power per nanosecond- -What is the mass on particle J?
9. ### Chemistry

Two atoms with charges of +1 and -1 are separated by a distance of 0.5 angstroms. What would happen to the lattice energy between ions if the distance increases to 2 angstroms?
10. ### Science

which of the following is true about kinetic energy select all that apply A as an objects speed increases kinetic energy decreases B only moving objects have kinetic energy ••• C kinetic energy increases as an objects height …

More Similar Questions