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Straighter Line Physics with 100- correct answers
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Straighter Line Physics with 100- correct answers
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StraighterLine
Physics
with 100%
correct
answers
,already
graded 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
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