A student pushes a 12.0 kg box with a horizontal force of 20 N. The friction force on the box is 9.0 N. Which of the following is the best approximation of the box's acceleration?

As an array/module of cells gets larger in surface area, what happens to the amount of electricity that it can produce?

A bat locates insects by emitting ultrasonic "chirps" and then listening for echoes from the bugs. suppose a bat chirp has a frequency of 25 khz. part a how fast would the bat have to fly for you to just barely be able to hear the chirp at 20 khz?

What was the solar system like when the moon formed?

You stand on a bridge above a river and drop a rock into the water below from a height of 35m (assume no air resistance)

What was the first human invention to break the sound barrier?

Rauol's friend Johnny sets out from his house in the city. His displacement is 900 m 80° North of west. What is the x component of his displacement vector?

What is the relationship between gravity and mass? What is the relationship between gravity and distance?

A person performs 300 j of work over the course of 60 seconds how much power they did required

If you have a 90 V power source with a 30-Ω and 60-Ω resistor in series, what is the voltage drop over the 60-Ω resistor? 30 V 2 V 60 V 90 V

How is thermal energy transferred during convection?