Abead slides without friction around a loop_the_loop (see figure below). the bead is released from rest at a height h = 3.80r.

what is its speed at point a? (use the following as necessary: the acceleration due to gravity g, and r.)
v=__

how large is the normal force on the bead at point a if its mass is 4.10 grams?
magnitude=__
direction=downward

The density of a substance is 4.0 g/cm3. if a sample of the substance has a volume of 25 cm3 then what is the mass

Will give brainliest! jay rides his 2.0-kg skateboard. he is moving at speed 5.8 m/s when he pushes off the board and continues to move forward in the air at 5.4 m/s. the board now goes forward at 13 m/s.a. determine jay’s mass.b. determine the change in the internal energy of the system during this process.(express your answer to two significant figures and include the appropriate units.)

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n