A car accelerates at 0.7 m/s^2 with a force of 70 Newtons. What is it's mass?

After a car's engine has been running for a while, if you stand near the car's engine you can often feel heat coming from the engine as a result of a. radiation b. convection c. conduction

Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?