What is the efficiency of the machine in figure 7.2 if the weight of the box is 200 n and required 98 n of effort force?

a. 3.3%
b. 326%
c. 31%
d. 10.2%

An artificial satellite circles the earth in a circular orbit at a location where the acceleration due to gravity is 6.03 m/s^2. determine the orbital period of the satellite.

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?

Where should a carbon monoxide detector be mounted?