A refrigerator has a power of 90 W and is left on for 24 hours. A hair dryer has a power of 900 W and is on for 20 minutes. Which statement correctly
compares the energy used by these devices?
A. The refrigerator uses 6,696,000 J more than the hair dryer.
B. The refrigerator uses 3,224,000 J less than the hair dryer.
C. The refrigerator uses 1,080,000 J less than the hair dryer.
D. The refrigerator uses 7,776,000 J more than the hair dryer.

What type of nuclear decay causes the atomic number of an element to increase by 1?

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.