How much gravitational potential energy is gained by the system when a 3 kg object is lifted 15 m into the air?

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

Which situation will produce the greatest change of momentum

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.