Which kind of wave requires a medium for propagation?

a. radio

b. seismic

c. gamma ray

d. visible light

If the motor has an efficiency of ϵ = 0.6, determine the power that must be supplied to the motor when the elevator is hoisted upward at a constant speed of ve = 4 m/s.

Which defintion of heat is most scientifically accurate

Which does not increase the strength of an electromagnet? A. more current in the solenoid B. using a "soft iron" core C. fewer turns in the coil D. more turns in the coil

The model of the universe that the earth is in the center is called

Why are fossil fuels important tools for intrepreting the past

A ball is rolling down a hill at + 1.0 m/s, The ball is uniformly accelerating at +4.9 m/s?, What will the ball's velocity be 4.0 s later? +8.9 x 100° m/s +2.0 x 10^1 m/s +2.1 x 10^1 m/s -1.9 x 10^1 m/s

What is the difference between unicellular and multicellular organisms?

Is momentum conserved in the collision?

Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five-rupees coin and a one-rupee coin?

In a laboratory, you determine that the density of a certain solid is 5.23*10-6kg/mm3. Convert this density into kilograms per cubic meters.