A boy drags a box of toys. It experiences a frictional force of 10N .calculate acceleration of the system ​

When an object is heated it contracts. a. true b. false

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?