The current in a hair dryer measures 21 amps. The resistance of the hair dryer is 8 ohms. What is the voltage?

Sound can travel through a medium, but it does not require a medium. a. True. b. False

Cold water (cp = 4180 J/kg·K) leading to a shower enters a thinwalled double-pipe counterflow heat exchanger at 15°C at a rate of 1.25 kg/s and is heated to 60°C by hot water (cp = 4190 J/kg·K) that enters at 100°C at a rate of 4 kg/s.

A satellite in orbit is not truly traveling through a vacuum. It is moving through very, very thin air.

A 600-kg car is going around a banked curve with a radius of 110 m at a steady speed of 24.5 m/s. what is the appropriate banking angle so that the car stays on its path without the assistance of friction

When the forces on an object have a net force of zero (the object is still or going constant speed).

How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57*10-21 newtons?

If you could see the electric field coming off a proton you would notice that electric field lines are

We wrap a light, nonstretching cable around a 10.0 kg kg solid cylinder with diameter of 38.0 cm cm. The cylinder rotates with negligible friction about a stationary horizontal axis. We tie the free end of the cable to a 14.

A 0.5kg baseball experiences a 10N force for a duration of 0.1s. What is the change in velocity of the baseball

A beam of light passes from air into a cube of zirconium if the angle of incidence is 40"what is the angle of refraction?