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which of the following best describes the use of a renewable resource? explain how u know pls

select one:
a. propane is a product you might use to barbeque; it comes from natural gas and processing oil.
b. coal is mined from deep passages dug in a mountainside and burned to generate electricity.
c. oil is pumped from beneath the ocean floor and refined into jet fuel to power airplanes.
d. wind turbines gather energy from the wind and convert it into electrical energy.

During a car accident, a 125kg driver is moving at 31m/s and in 1.5s is brought to rest by an inflating air bag. what is the magnitude of the change in momentum to the driver

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?

1700 j of energy is lost from 0.14 kg object , the temperature decreases from 50°c to 45°c what is the specific heat of this object, amd what is the material ?