Which of the following is a source of direct electric current?

A. transformer

B. Coulomb

C. switch

D. battery

Prove that relation between S. I unit of energy and commercial unit of energy

A bullet travels at 870 m/s. How long will it take to travel 1 m?

A clothes dryer uses about 29 amps of current from a 240 volt line. How much power does it use?

Because fermentation takes place in the absence of oxygen, it is said to be a. aerobic b. anaerobic c. cyclic d. essential to oxygen production

The use of force to move an object is

What is a lenticular (S0) galaxy? A galaxy with a disk and central bulge like a spiral galaxy, but with no spiral arms A galaxy with a smooth brightness profile, lacking the central bulge and disk of a spiral galaxy A spiral galaxy with fuzzy and

Which process causes wells on land to become saline, making them unusable for drinking water? A. Erosion B. Echo sounding C. Eutrophication D. Groundwater infiltration

A farmer uses a tractor to pull a 150 kg bale of hay up a 15∘ incline to the barn at a steady 5.0 km/h. The coefficient of kinetic friction between the bale and the ramp is 0.40. Part A What is the tractor's power output?

Identify the conditions for an elastic collision in a closed system. Check all that apply. Energy is conserved. Velocities may change. Momentum is conserved. Kinetic energy is conserved. Objects stick together after the elastic collision.

When the velocity of a mass on a spring is zero, the acceleration is at