The speed of sound in air is about 340 meters per second. How long does it take a sound wave to travel a distance of 7800 meters

In which layer does erosion take place? And why?

What does it mean for a substance to be an insulator?

Lithium atoms split when they are blank with a stream of protons

A car weighing 1500 kg drives at 5m / s when it collides with a wall. It takes 0.20 seconds until the car is completely stationary. The driver weighs 90 kg. How much average force is the driver under the crash?

An example of something that is biodegradable is a leaf in a compost pile. a. True b. False

Two lab carts are pushed together with a spring mechanism compressed between them. Upon release, the 5.0 kg cart repels one way with a velocity of 0.12 m/s. The 2.0 kg cart goes the other way. At what velocity does it travel?

A bowling ball has a mass of 7.2 kg and a weight of 70.6 N. It moves down the bowling alley at 1 m/s and strikes a pin with a force of 15.0 N. What is the force that the pin exerts on the bowling ball?

an electric clothes dryer has a resictance of 16 Ohms it drawes 15 A of current what is the voltage in volts of the wall outlet that it is pluged into

A lorry with a mass of 5000kg accelerates to overtake a caravan on the motorway. Its acceleration is 1.5m/s². What force must the engine be providing? You can ignore the effects of friction and air resistance

Norma kicks a soccer ball with an initial velocity of 10.0 meters per second at an angle of 30.0% if the ball moves though the air for 3.2 seconds what's the horizontal distance traveled by the ball