Alisa, a skateboarder, is riding down a hill. If Alisa and the skateboard are considered a single object, what forces are acting on her? check all that apply

push

gravity

normal force

friction

tension

Describe how the current in a circuit changes if the resistance increases and the voltage remains constant

The two forces f1 and f2 acting at A have a resultant force of Fr = - 100lb. determine the magnitude and coordinate direction angles of f2

How does newtons laws apply to a car crash

How long must a current of 100mA flow so as to transfer a charge of 80 C?

Which of the following is true about parallax? A) It is used to measure distances to stars. B) The parallax measures of distant stars are to tough to measure C) The nearest stars have the smallest parallax angles. D) Both A and B.

What is an organ that has villi to absorb the nutrients

Assume you are a Medieval knight attacking a castle with a cannon. The ball leaves the cannon with a speed of 47.7 m/s. The barrel's angle with respect to the ground is 43.

0.005 kg of copper was heated from 20°C to 80°C. How much energy was used to eat Cu? (Specific heat capacity of Cu is 385 J/kg °C)

Assuming that the bohr model is valid, what is the kinetic energy of a photoelectron liberated by a photon with a the given wavelength from a state with given z and n

Compare the acceleration of a motorcycle that accelerates from 80 km/h to 90 km/h