Mechanics | Relativity Answers

A bug jumps straight up to a maximum height of 0.36 m. What is its initial velocity (in m/s)
as it leaves the ground? Ignoring air resistance.
a) 2.7 b) Zero c) 7.1 d) 1.8 e) 4.8

During one heartbeat about 0.06 kg of blood is accelerated from rest to a velocity of 1m/s
upward in a time 0.1s. What is the force creating this movement?
a) 10 N
b) 1 N
c) 0.6 N
d) 0.06 N
e) 0.1 N

An 8.0 kg block is released from rest, v1 = 0 m/s,
on a rough incline. The block moves a distance of
1.6 m down the incline, the work done by the weight
is closest to:

file:///Users/123456/Desktop/Document1.htm

a) +80 J
b) +100 J
c) +120 J
d) -100 J
e) -80 J

A 2-kilogram box hangs by a massless rope from a
ceiling as shown. A force slowly pulls the box horizontally to
the side until the force is equal to 10 N. The box is then in
equilibrium. The angle that the rope makes with the vertical
is closest to:

http://2.bp.blogspot.com/-fEj7d6BMz5Q/Tlg9jogs2QI/AAAAAAAAAFk/HS5_yC2TDPQ/s1600/BoxInEqm.png

(a) sin-1(0.5)
(b) tan-1(2.0)
(c) sin-1(2.0)
(d) 45o
(e) tan-1(0.5)

Two forces are applied to a 2.0-kilogram block on a frictionless horizontal surface, as
shown in the diagram below. The acceleration of the block is

http://www.webassign.net/regents/rphys_jun00-12.gif

(a) 1.5 m/s2 to the right
(b) 2.5 m/s2 to the left
(c) 2.5 m/s2 to the right
(d) 4.0 m/s2 to the left
(e) non of the above

Which of the following situations is impossible?
A) An object has zero velocity but non-zero acceleration.
B) An object has velocity directed east and acceleration directed east.
C) An object has constant non-zero acceleration and changing velocity.
D) An object has velocity directed east and acceleration directed west.
E) An object has constant non-zero velocity and changing acceleration.

The ambulance (mass 3000kg) shown in the Figure(2) slides (wheels locked) down a frictionless incline that is 10 m long. It starts from rest at point A, and continues along a rough surface until it comes to a complete stop at point C. If the coefficient of kinetic friction between the ambulance and the horizontal rough surface is 0.1. (a) Calculate the speed of the ambulance at point B.(b) Compute the distance d the ambulance slides on the horizontal rough surface before stopping

http://media.cheggcdn.com/media/5ae/5ae1e13e-b7ad-4a3e-957c-7e86cf058c94/php6vjUrJ.png

The diagram below shows a 5.0 kilogram bucket of water being swung in a horizontal circle of 0.70
meter radius at a constant speed of 2.0 meters per second.
The magnitude of the centripetal force on the bucket of water is approximately
(1) 5.7 N (3) 29 N
(2) 14 N (4) 200 N

Ten seconds after an electric fan is turned on, it was fund to have an angular speed of
300 rev/min, Its average angular acceleration is:

1800 rev/sec2
3.14 rad/sec2
30 rad/sec2
30 rev/sec2
50 rev/min2

Starting from rest, Ali goes around a circular path (of 100 m diameter) with a constant
angular acceleration a. If he completed 4 rounds every 3 min, what is his angular
displacement, and angular acceleration and final angular speed, ?

More information is needed
8, 0.56 rad/sec2, 101 rad/sec
800, 0.078 rad/sec, 12.4 rad/sec2
8 , 0.003 rad/sec2, 0.56 rad/sec
800, 0.078 rad/sec2, 12.4 rad/sec