An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal of heat per second when an electric potential difference of 12 V is placed across its leads. What is the resistance of the heater wire?

An ideal solenoid having a coil density of 5000 turns per meter is 10 cm long and carries a current of 4.0 a. what is the strength of the magnetic field at its center?

Marine geology is a subspecialty of a. oceanography. b. maritime science. c. geology. d. environmental sciencemarine geology is a subspecialty of: oceanography.

It is possible that the universe may A. further break itself apart, creating new structures in space. B. explode within the next million years. C. continue to expand forever. D. dissipate from lack of sufficient matter.

An electromagnetic wave is a mechanical wave. O A. True O B. False

Internal forces do not affect the conservation of momentum because (a) they cancel each other, (b) their effects are canceled by external forces, (c) they can never produce a change in velocity, (d) newton's second law is not applicable to them.

A uniformly charged conducting sphere of 1.1 m diameter has a surface charge density of 6.2 µC/m2. (a) Find the net charge on the sphere. (b) What is the total electric flux leaving the surface of the sphere?

A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 12 A, while that of the vacuum cleaner is 5.7 A. Determine the power consumed by (a) the blow-dryer and (b) the vacuum cleaner.

4. A 40 kg child and a 30 kg child want to balance themselves on a 4 meter, 50 kilogramn see-saw. Where should the fulcrum be placed?

A 2-kg object is dropped from a height of 1000 m. What is the force of air resistance on the object when it reaches terminal velocity

What is the approximate increase in size from a 1 w to a 2w carbon resistor?