Which of the following statements regarding electric current is true?

Note: There is a poll embedded within this post, please visit the site to participate in this post's poll.Which expression gives the acceleration of a 1kg mass on a frictionless inclined plane at 30^{o} to the horizon, given that g = 9.8 m/s^{2}?

What happens to the kinetic energy of a race car if its speed is tripled?

Note: There is a poll embedded within this post, please visit the site to participate in this post's poll.An athlete runs around a 400 meter track in 60 seconds, starting and finishing at the same place. What is her speed and velocity in m/s?

Note: There is a poll embedded within this post, please visit the site to participate in this post's poll.Three identical 12 ohm resistors are connected in parallel to a 8V battery. What is the total power dissipated in the circuit?

Note: There is a poll embedded within this post, please visit the site to participate in this post's poll.An object undergoing simple harmonic motion is observed to have a time interval of 4 seconds between the two extremes of its displacement from equilibrium. What is the frequency of this motion?

Note: There is a poll embedded within this post, please visit the site to participate in this post's poll.An object of mass 3 kg floats motionless in a fluid of specific gravity 0.8. What is the magnitude of the buoyant force? (Use g = 10 m/s^{2}).

A construction worker uses a crane to vertically lift an object weighing 2000 N to the top of a platform at a constant rate. If it takes 30 seconds to lift the object 150 meters, what is the rate of energy consumed by the motor in the crane?

Note: There is a poll embedded within this post, please visit the site to participate in this post's poll.A small cannonball weighing 5-kg is launched vertically in the air with an initial kinetic energy of 500 joules. How high will the cannonball travel above the launch point?

Note: There is a poll embedded within this post, please visit the site to participate in this post's poll.A force of 1 minion can cause 1 gram to accelerate at 1 cm/s^{2}. How many newtons are equivalent to 1 minion?