How many minutes will it take the school bus to complete the 52-km trip back to the school at an average speed of 1.0 km/
min?
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The least penetrating form of radiation is

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?