Straighter Line Physics Actual Exam Update
2024 | StraighterLine Physics Exam Latest
2024 -2025 Questions and Correct Answers
Rated A+
When a small car pulls a trailer for a move, which of the following
explains why the trailer moves? -ANSWER-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? -ANSWER-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. -ANSWER-θ=4∘
Match each of the following descriptions of motion with the appropriate
graph.
resting
uniform motion
accelerated motion
oscillating motion -ANSWER-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.) -ANSWER-0.47 s
,Given the vectors C=1.5i^+6.2j^ and D=4.4i^+7.3j^, calculate the
magnitude of their vector product. -ANSWER-16.3
Which of the following statements concerning friction between the
surfaces of two objects is correct? -ANSWER-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? -ANSWER-1.5 J
Why is (vector) A⋅ (vector) B =AxBx+AyBy -ANSWER-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? -ANSWER-mv 2/r
Which of the following applies to the tangential velocity v of uniform
circular motion? -ANSWER-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? -
ANSWER-42°
Which of the following is not a vector? -ANSWER-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) -ANSWER-PV = nRT
,Two vectors can be added graphically by __________. -ANSWER-
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? -ANSWER-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? -ANSWER-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? -ANSWER-0.29 N⋅m
Which is the definition of a derived unit? -ANSWER-A unit which is
based on other (basic) units.
Which is not a basic unit? -ANSWER-velocity
What would happen to the precession of a gyroscope if it were
spinning in the opposite direction? -ANSWER-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? -ANSWER-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) -ANSWER-41rad/s2
Would an object precess faster if it had more angular momentum? -
ANSWER-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? -ANSWER-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? -ANSWER-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. -ANSWER-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
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