Why is a hollow pipe stronger than a solid pipe?

A very long solenoid of inner radius 4.25 cm creates an oscillating magnetic field B of the form B = B m a x cos (ω t) For this solenoid, B max = 0.00275 T and ω = 349 rad/s.

Jason takes off from rest across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible). The skis have a thrust of 200 N and a coefficient of kinetic friction on water of 0.10.

A submarine send out a pulse of ultrasound to check how close it is to the seabed the reflected waves are detected 0.2 seconds later work out the total distance travelled by the detected wave is the speed of ultrasound is in water is 1500 M/S

If energy seems to disappear what actually happened to it

A mining company wants to build a modern processing plant that is safe for workers. the location of the plant is close to the mining operation, which has inadvertently exposed some sources of radionuclides.

a 2.0 kg mass moving to the east at a speed of 4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0 kg mass. how much kinetic energy is lost during

How did people years ago find out which side of a magnet was north and which was south?

Which change occurs when an atom undergoes decay?

A wave is moving toward shore with a velocity of 18.0 m/s. If its period is 4 s, what is its wavelength? Explain your answer.

Describe how the Catapult works?