Which of the following is most useful to determine how much energy is being used by a circuit in a given amount of time?

a. power

b. current

c. voltage

d. resistance

A woman 5.5 ft walks at a rate of 6 ft/sec towards a street light that is 22 ft above the ground. At what rate is the length of her shadow changing when she is 15 ft from the base of the light?

Which of the following statements is true of the carbohydrate glucose? A. Glucose is a pentose sugar B. Glucose is a polysaccharide C. Glucose contains carbon, hydrogen, and oxygen atoms

Which describes the role of the muscular system during physical activity? Select all that apply. 1: It allows for movement. 2: It controls the breathing rate. 3: It forces venous blood to return to the heart. 4: It controls the heart rate.

Suppose a 63-kg boy and a 40-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.

What motion produces two high tides in a day?

What holds the atoms together in a covalent bond

The sun is the centermost star of our solar system. a. True b. False

When an electron moves from a lower to a higher energy level

Which of the following is all matter made of? A. Hot particles B. Cold particles C. Constantly moving particles D. Nonmoving particles

Which of the following has longest wavelength, a) blue light b) red light c) x-rays d) gamma rays?