A ball is thrown into the air with an initial velocity that has a horizontal component of 4.0 m/s [right] and a vertical component of 3.0 m/s [up]. What is the speed of the ball at the top of its trajectory (ignore air resistance).
Answer
0
3.0 m/s
4.0 m/s
5.0 m/s
9.8 m/s
Question 2
Question
The magnitude of the acceleration of the same ball is:
Answer
0
3.0 m/s
4.0 m/s
5.0 m/s
9.8 m/s
Question 3
Question
The horizontal acceleration of the ball is 0.
Answer
True
False
Question 4
Question
Box A is released from the top of a frictionless ramp inclined at 30 degrees (I couldn't find the symbol) to the horizontal at the same time that Box B is dropped from the same height into free fall. Which reaches the ground first.
Answer
Yes
Same time
Box A
Box B
Question 5
Question
The normal force of a box on an inclined plane is [blank_start]perpendicular to the surface[blank_end] and equal in magnitude to [blank_start]mgcosθ[blank_end].
Answer
perpendicular to the surface
parallel to the surface
equal in magnitude to the weight
up
mgcosθ
mgsinθ
mgtanθ
the weight of the box
gravity
Question 6
Question
A car of mass M collides with a truck of mass 3M. The force exerted by the car on the truck must be [blank_start]equal to[blank_end] the force exerted by the truck on the car.
Answer
equal to, equal, same as
Question 7
Question
A person of mass M is in an elevator that has an acceleration of A [up]. The apparent weight of that person is M(A+g).