An arc welder provides 250A of current when operating with a voltage of 40V. What is the power required by this welder? Explain your answer.

Which electromagnetic wave would have a wavelength approximately the size of the tip of a pencil?

2. Carla's favorite ball is bright blue when it is outside in the direct sunlight. Inside, the ball appears to be almost green. Why does Carla's ball seem to change colors? A.

Which of the following is a part of a wave? a. crest c. trough b. drift d. both a and c

Which is evidence that the reaction below is a redox reaction? 2Na+Cl2 - > 2NaCl A. The sodium atom is a pure element as a reactant and becomes part of a compound. B. Two different elements take part is the reaction. C.

The top of the cylinder head is sealed by the A. valve cover. B. oil retainer. C. oil pan. D. front cover.

The power of a 1.5-volt alkaline cell varies with the number of hours of operation. A brand new D-cell can deliver as much as 13 A through a copper wire connected between terminals. Determine the power of a brand new D-cell.

You measure a watch's hour and minute hands to be 7.4 mm and 12.1 mm long, respectively. Part A In one day, by how much does the distance traveled by the tip of the minute hand exceed the distance traveled by the tip of the hour hand?

Describe the possible long term impact of a catastrophic event

Calculate the mass defect of the helium nucleus 42He. The mass of neutral 42He is given by MHe=4.002603u.

A transparent film laminated to a fabric is identified in the study material as a. stretch fabric. b. PVC. c. a skin. d. two-faced fabric