Which pair of sentences is describing the same velocity? A.
A car is parked. A car is moving in circles.
B.
A bus drives 40 miles per hour north. A truck drives 50 miles per hour north.
C.
A boy walks east at 6 kilometers per hour. A girl walks west at the same speed as the boy.
D.
Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour.

3. a lunar exploration vehicle was created by a research team. it weighs 3,000 kg on the earth. it needs an acceleration of 10 m/s2 on the moon. in order to have the same acceleration, what will be the net force acting on the vehicle on the earth?

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.

Which form of pure carbon is so hard that it can be used in cutting tools?