A skydiver slows down from 54 m/s to 4 m/s by opening his parachute. This change takes 0.75 seconds. What is the skydiver's acceleration?
A. 50 m/s2 up
B. 9.8 m/s2 up
O c. 67 m/s2 up
D. 38 m/s2 up

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

An architect plans to use solar energy to heat the next house he designs. what principle of absorption and infrared energy can be applied to the design of the new house? how could she apply to those principals?