Question

1. While you are seated on a chair, the resultant force on you is ..?

A. zero

B. up

C. down

D. dependent on your weight

2. Action-reaction forces

A. sometimes act on the same object

B. always act on the same object

C. may be at right angles

D. always act on different objects

3. A net force (F) acclerates a mass (m) with an accleration (a). If the same net force is applied to mass 2m, then accleration will be?

A. 4a

B. 2a

C. a/2

D.a/4

4. A ball is thrown with a velocity of 20 m/s at an angle of 60 degrees above the horizontal. What is the horizontal component of its instantaneous velocity at 2.0 seconds after its release?

A. 10 m/s

B. 17 m/s

C. 20 m/s

D. 0

5. Suppose a ball is thrown straight up. which if the following statements best describes the ball's velocity and acceleration at the stant which it reaches the highest point?

A. both its velocity and acceleration are 0

B. it's velocity is 0 and it's acceleration is not 0

C. it's velocity is not 0 and it's acceleration is 0

D. neither it's velocity not it's acceleration is 0

Answer #1

Q1.Centripetal force is v^2/r. It is supplied by:
a. the rotation
b. some physical force, or else the object will move in a
straight line
c. it is the only force if the object is moving through a
gravitational field
d. none is needed if its speed is below a prescribed limit
Q2. The distance of an object from planet M is D. the
gravitatiolnal force on the object is F. If the distance is
decreased by 1/4, what is...

5:Two spacecraft in outer space attract each other with a force
of 200 N. What would the attractive force be if they were twice as
far apart?
a. 5 N b. 400 N c. 25 N d. 100N e. 50 N
7:In straight line motion the
a. acceleration is vertical and the displacement is horizontal
b. acceleration is perpendicular to the displacement c.
acceleration is vertical, while the displacement can be in any
direction d. acceleration is always the same...

As part of a carnival game, a 0.528-kg ball is thrown at a stack
of 18.8-cm tall, 0.383-kg objects and hits with a perfectly
horizontal velocity of 12.8 m/s. Suppose the ball strikes the
topmost object as shown to the right. Immediately after the
collision, the ball has a horizontal velocity of 3.60 m/s in the
same direction, the topmost object now has an angular velocity of
1.63 rad/s about its center of mass and all the objects below are...

1.Two children are riding on a merry-go-round. Child A is at a
greater distance from the axis of rotation than child B. Which
child has the larger angular displacement?
A.They have the same zero angular displacement.
B.There is not enough information given to answer the
question.
C.Child A
D.Child B
E.They have the same non-zero angular displacement.
2.A cart changes its speed from 90 m/s to 100 m/s in 10 seconds.
During this interval its acceleration is
A.1 m/s2.
B.none...

A B C D 20. A ball rolls off a table with a horizontal velocity
of 6 m/s. If it takes 0.5 seconds for it to reach the floor: What
is the vertical component of the ball's velocity in m/s just before
it hits the floor? (Use g = 10 m/s^2) a) 6, b) 10, c) 3, d) 5.
A B C D 21. A ball rolls off a table with a horizontal velocity
of 6 m/s. If it takes...

Please answer all questions thanks.
(1) A ball is thrown vertically up into the air. You know that
the ball rises while slowing down, then it is for a moment at rest,
then it speeds back up while it heads down toward the ground. At
the moment in time when the ball is at its very highest point in
the trajectory, the net force on the ball is ...
Group of answer choices
a. zero because the ball is at...

1. Motion of an object depends on its velocity only.
True
False
2. A car with a mass of 2500 kg is traveling at a speed of 30 m/s
due east. Choose the most appropriate answer to its momentum.
a. 30 m/s due east
b. 30 m/s
c. 75,000 kgm/s
d. 75,000 kgm/s due east
3. A car is traveling at 70 mph and then is involved in an accident
with a head-on collision into a very solid wall. As...

4. A mass is attached to a spring with a force
constant of 40 N/m. The spring and mass are set to simple harmonic
motion with a period of 0.50 s on a frictionless, horizontal
surface.
a) What is the mass of the object?
b) What is the frequency of the
oscillations?
c) At which point will the object be at maximum
speed? Minimum speed?
d) At which point will the object be at max
acceleration? Minimum acceleration?

A ball is thrown up onto a roof, landing 3.10 s later at height
h = 18.0 m above the release level. The ball's path just
before landing is angled at θ = 63.0˚ with the roof.
(a) Find the horizontal distance d it
travels. (Hint: One way is to reverse the motion, as if it
is on a video.) What are the (b) magnitude and
(c) angle (relative to the horizontal) of the
ball's initial velocity?

In the figure here, a ball is thrown up onto a roof, landing
3.20 s later at height h = 21.0 m above the release level.
The ball's path just before landing is angled at ? = 67.0?
with the roof. (a) Find the horizontal distance
d it travels. (Hint: One way is to reverse the
motion, as if it is on a video.) What are the (b)
magnitude and (c) angle (relative to the
horizontal) of the ball's initial...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 4 minutes ago

asked 7 minutes ago

asked 21 minutes ago

asked 40 minutes ago

asked 52 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago