A2 kg stone moves with a speed of 1 m/s. a second 2 kg stone is moving twice as fast. compare their kinetic energies.
a. the second stone has 0.5 times as much kinetic energy.
b. the second stone has 2 times as much kinetic energy.
c. the second stone has 0.25 times as much kinetic energy.
d. the second stone has 4 times as much kinetic energy.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.