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Straighter Line Physics Questions and Correct Answers
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<<<<< Elscores <<<<<>>>>> 20/08/2024 08:06>>>>Straighter Line Physics Questions and Correct
Answers
When a small car pulls a trailer for a move, which of the following explains why the trailer
moves?
✓ ~: 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?
✓ ~: 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.
✓ ~: θ=4∘
Match each of the following descriptions of motion with the appropriate graph.
resting
uniform motion
accelerated motion
oscillating motion
✓ ~: 1-B; 2-D; 3-C; 4-A
, <<<<< Elscores <<<<<>>>>> 20/08/2024 08:06>>>>
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.)
✓ ~: 0.47 s
Given the vectors C=1.5i^+6.2j^ and D=4.4i^+7.3j^, calculate the magnitude of their vector
product.
✓ ~: 16.3
Which of the following statements concerning friction between the surfaces of two objects is
correct?
✓ ~: 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?
✓ ~: 1.5 J
Why is (vector) A⋅ (vector) B =AxBx+AyBy
✓ ~: 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?
, <<<<< Elscores <<<<<>>>>> 20/08/2024 08:06>>>>
✓ ~: mv 2/r
Which of the following applies to the tangential velocity v of uniform circular motion?
✓ ~: 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?
✓ ~: 42°
Which of the following is not a vector?
✓ ~: 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)
✓ ~: PV = nRT
Two vectors can be added graphically by __________.
✓ ~: 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?
✓ ~: 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?
, <<<<< Elscores <<<<<>>>>> 20/08/2024 08:06>>>>
✓ ~: 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?
✓ ~: 0.29 N⋅m
Which is the definition of a derived unit?
✓ ~: A unit which is based on other (basic) units.
Which is not a basic unit?
✓ ~: velocity
What would happen to the precession of a gyroscope if it were spinning in the opposite
direction?
✓ ~: 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?
✓ ~: I = 8.85 kg•m / s
F = 4.43 × 103 N
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