A student applies a 4.25 N rightward force to a 0.765 kg book to accelerate it across a tabletop. The coefficient of friction between the book and the tabletop is 0.410. First draw the FBD, then determine the force of normal and the force of friction What is the force of normal?
a. 765 N
b. .078 N
c. 7.497 N
d. 76.5 N
What is the force of friction?
a. 31.8 N
b. .31 N
c. 30.7 N
d. 3.07 N

An object is dropped from a tower, 400 ft above the ground. the object's height above ground t seconds after the fall is s(t)equals400 minus 16 t squared. determine the velocity and acceleration of the object the moment it reaches the ground. the velocity of the object the moment it reaches the ground is nothing ft/s.

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?