Pete is driving down 7th Street. He drives 215 Meters in 20 seconds. Assuming
he does not speed up or slow down, what
is the speed?

State the right hand rule of the direction of magnetic field in a conductor carrying current

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)