If the primary coil of a transformer has 200 turns and is supplied with 120 v ac power, how many turns must the secondary coil have to provide 12 v ac power?

A 30 kg child on a skateboard experiences a 75-N force as shown F = 75 NOIA What is the expected acceleration of the child?

The tides are ... a renewable energy source a constant energy source an unreliable energy source which is the right statement

What is the smallest radius of an unbanked (flat) track around which a bicyclist can travel if her speed is 29.0 km/h and the coefficient of static friction between tires and track is 0.

Which vector has an x-component with a length of 4?

What happens when the temperature of a substance decreases significantly? A. Most substances will expand. B. Most substances will gain atoms. C. Most substances will disappear. D. Most substances will contract.

In the diagrams, the solid green line represents Earth's rotational axis and the dashed red line represents the magnetic field axis. Which diagram accurately shows Earth's magnetic field?

In order for natural selection to occur, Charles Darwin stated we must begin with a population of organisms that has genetic A) competition. B) engineering. C) reproduction. D) variation.

How fast must a 6 kg cat run to have kinetic energy of 150 j?

Alleles are variations of genes. How are they expressed? A. repetitive or creative B. major or minor C. temporary or permanent D. dominant or recessive

Which statement about electric force is true?