A toaster receives 216,000 J of energy from the mains. 90,000 J of this is transferred as useful energy to the thermal energy stores of a bagel. What is the efficiency of the toaster? Give your answer as a percentage to the
nearest whole number.

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .