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STRAIGHTER LINE PHYSICS QUESTIONS AND ANSWERS
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STRAIGHTER LINE PHYSICS QUESTIONS AND ANSWERS
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STRAIGHTER LINE PHYSICS QUESTIONS ANDANSWERS
When a small car pulls a trailer for a move, which of the following explains why the
trailer moves? - Answers-While the force of the trailer on the car is equal and opposite
to the force of the car on the trailer, the total of all forces acting on the car are
unbalanced.
Suppose you are driving a car at a constant speed of 40 mph in a straight line. All of a
sudden the road curves to the right but you manage to keep driving at exactly the same
speed. Which of the following statements is correct? - Answers-There was a net force
acting on the car.
Given the vectors C=2i^+7j^ and D=14i^+38j^D, find the angle θ between them. -
Answers-θ=4∘
Match each of the following descriptions of motion with the appropriate graph.
resting
uniform motion
accelerated motion
oscillating motion - Answers-1-B; 2-D; 3-C; 4-A
A juggler is juggling 3 balls. If she throws them 2.4 m in the air at an angle of 80°
relative to the horizontal, what is the time between throws? (You should ignore air drag
and the time it takes for the juggler to move balls from one hand to the other.) -
Answers-0.47 s
Given the vectors C=1.5i^+6.2j^ and D=4.4i^+7.3j^, calculate the magnitude of their
vector product. - Answers-16.3
Which of the following statements concerning friction between the surfaces of two
objects is correct? - Answers-The force of friction mostly depends on the nature of the
two surfaces.
A 2.5 kg object is suspended from a spring with a spring constant of 48 N / m. The mass
is pulled 0.25 m downward from its equilibrium position and released. Which of the
following is the maximum kinetic energy of the object? - Answers-1.5 J
Why is (vector) A⋅ (vector) B =AxBx+AyBy - Answers-All the cross-terms are equal to
zero.
Consider a mass m that is attached to a rope such that the mass is in uniform circular
motion. Which of the following is the magnitude of the centripetal force? - Answers-mv
2/r
,Which of the following applies to the tangential velocity v of uniform circular motion? -
Answers-constant speed but not constant velocity
If the cross product of a vector of length 5 and a vector of length 3 results in a vector of
length 10, what is the angle between them? - Answers-42°
Which of the following is not a vector? - Answers-2 kg of mass under a table
The Ideal Gas law is given by which equation? (n is the number of moles of the gas) -
Answers-PV = nRT
Two vectors can be added graphically by __________. - Answers-adding them tip to tail
Consider a rectangle with a base of 0.567 m and a height of 1.606 m. What is its area? -
Answers-0.911 m2
A mass of 5.2 kg is accelerated to 4.0 m / s2 when a force of magnitude F is applied to
it. If the same force is applied to another object causes it have an acceleration of 1.8 m /
s2, what is the mass of this object? - Answers-12 kg
The equation for torque is given by τ=F×dτ where F is a force applied at a distance d→
from the axis of rotation. Which of the following is the magnitude of torque resulting from
a 2.4 N force applied 17 cm from the point of rotation if the force is applied at a 45∘
angle to the displacement vector? - Answers-0.29 N⋅m
Which is the definition of a derived unit? - Answers-A unit which is based on other
(basic) units.
Which is not a basic unit? - Answers-velocity
What would happen to the precession of a gyroscope if it were spinning in the opposite
direction? - Answers-It would precess in the opposite direction.
A 0.500 kg steel ball is dropped from a height of 4.00 m onto a horizontal steel slab. The
collision appears elastic in that the ball rebounds to its original height. If the collision
lasts for 2.00 × 10−3 s, which of the following is the impulse imparted to the ball and the
average force applied to the ball during the collision? - Answers-I = 8.85 kg•m / s
F = 4.43 × 103 N
A 2.6 cm × 5.2 cm domino of mass 18 g is set in the position shown and released.
Taking the domino to be a uniform rectangle plate, what is its angular acceleration about
the corner that rests on the surface? The moment of inertia of a uniform rectangular
plate with side lengths a and b about an axis running perpendicular to it and through its
center is I=112M(a2+b2) - Answers-41rad/s2
, Would an object precess faster if it had more angular momentum? - Answers-No,
because the angular velocity of precession is inversely proportional to the magnitude of
the gyroscope's angular momentum
A mass-spring system has an amplitude of0.820 m and a period of 0.690 s. If the mass
attached is 0.500 kg, what is the acceleration at half the amplitude? - Answers-34.0m/s2
A 0.200 kg dart is fired horizontally at a speed of 2.75 m / s when it hits a 0.700 kg block
of wood suspended by a string. The nose of the dart sticks into 0.00210 m the wood.
Together the dart and block swing upwards from a height of 0.0500 m above a table to
0.128 m above the table. Which of the following is the average force the dart applies to
the block during impact? - Answers-32.4 N
A 16 lb bowling ball is resting in an angled crook, as shown. What is the force exerted
on the ball by the right-hand surface? 1 Newton is equivalent to 0.225 lb. - Answers-68
N
An empty freight train car of mass 10,000 kg is rolling along a level section of track at
2.00 m / s. It collides with a loaded car of weight 1.96 × 105 N, which is at rest. The cars
couple upon collision. Which of the following is the speed of the train after the collision?
- Answers-0.667 m / s
A 1,450 kg car moves with a speed of 25.0 m / s when it collides with a stationary car
having a mass of 1,550 kg. The two vehicles lock bumpers on impact. The two cars then
collide with a stationary third car of mass 1,250 kg. During this second impact, the third
vehicle becomes attached to the second but the first car is breaks free and moves at
0.125 m / s in the opposite direction. Which of the following is the final velocity of the
second and third cars after the final collision? - Answers-13.01 m / s
Tom and Joe are trying to fly a new style of kite that they have invented. Both of them
are holding strings attached to the kite. The tension in each string is 126 N. The angle
between the strings is 36°. Unfortunately, the kite will not rise in the air, and the strings
held by Tom and Joe are essentially parallel to the ground. Tom and Joe have run a
distance of 100 m trying to get the kite to fly. How much work have they done on the
kite? - Answers-24,000 N • m
A spaceship is in space and currently at rest. The directive is given to accelerate from
rest to a speed of 2.90 × 103 m / s. If the fuel budgeted for this action is 400 kg, which
of the following is velocity of the exhaust gas required if the ship mass is 7.38 ×103 kg?
- Answers--5.5 × 104 [m / s]
When applied to a system, a nonconservative force _____________. - Answers-cannot
generate potential energy with the system.
Two identical boxes are moved in equal distances in the horizontal direction. Box A
experiences a constant net force F applied at an angle θ to the horizontal and box B
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