Aplanet is 15 light years from earth. at which of the following speeds will the crew of a spaceship complete the trip to the planet in 8 years?
a) 0.78c
b) 0.85c
c) 0.88c
d) 0.92c

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

In a system, when potential energy decreases, then entropy also decreases. true false

An electric clothes dryer has a resistance of 8 ohms. it draws 30 a of current. what is the voltage, in volts, of the wall outlet that it is plugged into?