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r3dxP
8. For each statement, write true or false.
A)only the net force acting on an object can do work.
i think its TRUE.
B)no work is done on a particle that remains at rest.
i think its TRUE.
C)a force that is always perpendicular to the velocity of a particle never does work on the particle.
i think its TRUE.
^ please correct me if I am wrong.. ^ thx.
6. A particle of mass m moves along the x axis. Its position varies with time according to x=2t^3 + 4t^2 where x is in meters and t is in seconds.
B)find the power delivered to the particle at any time t.
?
C)the work done by the force from t=0 to t=11
im guessing i have to integrate the equation 2t^3 + 4t^2 with 11 on top right of the integration sign and 0 on the bottom of the integration sign.
any comment will be hhelpful. thanks in advance!
10. If a ski lift raises 100 passengers averaging 660N in weight to a height of 150m in 60s, at constant speed, what average power is required of the force making the lift?
I got P = W/t = mgh/t = 660N*150m/60s = 1650W = 1.6kW
did i do this right?
A)only the net force acting on an object can do work.
i think its TRUE.
B)no work is done on a particle that remains at rest.
i think its TRUE.
C)a force that is always perpendicular to the velocity of a particle never does work on the particle.
i think its TRUE.
^ please correct me if I am wrong.. ^ thx.
6. A particle of mass m moves along the x axis. Its position varies with time according to x=2t^3 + 4t^2 where x is in meters and t is in seconds.
B)find the power delivered to the particle at any time t.
?
C)the work done by the force from t=0 to t=11
im guessing i have to integrate the equation 2t^3 + 4t^2 with 11 on top right of the integration sign and 0 on the bottom of the integration sign.
any comment will be hhelpful. thanks in advance!
10. If a ski lift raises 100 passengers averaging 660N in weight to a height of 150m in 60s, at constant speed, what average power is required of the force making the lift?
I got P = W/t = mgh/t = 660N*150m/60s = 1650W = 1.6kW
did i do this right?
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