PHY250 final exam WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL DEFINED
ANSWERS
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Terms in this set (225)
Given the vectors 𝐶→=2𝑖̂ +7𝑗̂ b. 𝜃= 4∘
→=2^+7�^ and 𝐷→=14𝑖̂ +38𝑗̂
�→=14�^+38�^, find the angle 𝜃�
between them
Select one:
a. 𝜃 = 86
b. 𝜃= 4∘
c. 𝜃 =0∘
d. 𝜃 = 10∘
,A spider lowers herself on a single d.The tension in the silk is less than the spider's
strand of silk at constant speed. weight.
Taking into account air resistance,
which of the following must be true?
Select one:
a.The tension in the silk is zero.
b.The tension in the silk equals the
spider's weight.
c.The tension in the silk is greater than
the spider's weight.
d.The tension in the silk is less than
the spider's weight.
Given the vectors 𝐴→=6𝑖̂ +3𝑗̂ d. 𝐴→⋅𝐵→ = 33
�→=6�^+3�^ and 𝐵→=𝑖̂ +9𝑗̂
�→=�^+9�^, find their scalar
product 𝐴→⋅𝐵→�→⋅�→
Select one:
a. 𝐴→⋅𝐵→=6𝑖̂ +27𝑗̂
b. 𝐴→⋅𝐵→=45
c. 𝐴→⋅𝐵→=54𝑖̂ +27𝑗̂
d. 𝐴→⋅𝐵→=33
,Which is the definition of a derived c. A unit which is based on other (basic) units.
unit?
Select one:
a. A unit which can be measured
directly.
b. A unit which can not be measured
directly.
c. A unit which is based on other
(basic) units.
d. A unit which can be derived from a
mathematical formula.
Torque is given by the formula, c. 0.41 N⋅m
𝜏→=𝐹→×𝑑→�→=�→×�→, where
𝐹→�→ is a force and 𝑑→�→ is a
displacement. 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 perpendicular to the
displacement vector?
Select one:
a. 0 N⋅m
b. 40.8 N⋅m
c. 0.41 N⋅m
d. 4.1 N⋅m
, When a small car pulls a trailer for a c. While the force of the trailer on the car is equal
move, which of the following explains and opposite to the force of the car on the trailer,
why the trailer moves? the total of all forces acting on the car are
unbalanced.
Select one:
a. The car exerts a larger force on the
trailer than the trailer does on the car.
b. The action-reaction pair is in the
linkage, which pulls the trailer with
larger force than that with which it
pulls the car.
c. 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.
d. The trailer will not move.
A Ferris wheel having a radius of 8 m b. No the Ferris wheel is not moving too fast.
has a velocity of 8 m / s. Is there a
danger of the riders flying off?
Select one:
a. Yes, the Ferris wheel is moving too
fast
b. No the Ferris wheel is not moving
too fast.
c. Possibly. It depends on the density
of the air.
d. Possibly. It depends on the cross
section of the riders.
QUESTIONS AND CORRECTLY WELL DEFINED
ANSWERS
Play your way to mastery with fun games
Match Blocks Charms NEW
Terms in this set (225)
Given the vectors 𝐶→=2𝑖̂ +7𝑗̂ b. 𝜃= 4∘
→=2^+7�^ and 𝐷→=14𝑖̂ +38𝑗̂
�→=14�^+38�^, find the angle 𝜃�
between them
Select one:
a. 𝜃 = 86
b. 𝜃= 4∘
c. 𝜃 =0∘
d. 𝜃 = 10∘
,A spider lowers herself on a single d.The tension in the silk is less than the spider's
strand of silk at constant speed. weight.
Taking into account air resistance,
which of the following must be true?
Select one:
a.The tension in the silk is zero.
b.The tension in the silk equals the
spider's weight.
c.The tension in the silk is greater than
the spider's weight.
d.The tension in the silk is less than
the spider's weight.
Given the vectors 𝐴→=6𝑖̂ +3𝑗̂ d. 𝐴→⋅𝐵→ = 33
�→=6�^+3�^ and 𝐵→=𝑖̂ +9𝑗̂
�→=�^+9�^, find their scalar
product 𝐴→⋅𝐵→�→⋅�→
Select one:
a. 𝐴→⋅𝐵→=6𝑖̂ +27𝑗̂
b. 𝐴→⋅𝐵→=45
c. 𝐴→⋅𝐵→=54𝑖̂ +27𝑗̂
d. 𝐴→⋅𝐵→=33
,Which is the definition of a derived c. A unit which is based on other (basic) units.
unit?
Select one:
a. A unit which can be measured
directly.
b. A unit which can not be measured
directly.
c. A unit which is based on other
(basic) units.
d. A unit which can be derived from a
mathematical formula.
Torque is given by the formula, c. 0.41 N⋅m
𝜏→=𝐹→×𝑑→�→=�→×�→, where
𝐹→�→ is a force and 𝑑→�→ is a
displacement. 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 perpendicular to the
displacement vector?
Select one:
a. 0 N⋅m
b. 40.8 N⋅m
c. 0.41 N⋅m
d. 4.1 N⋅m
, When a small car pulls a trailer for a c. While the force of the trailer on the car is equal
move, which of the following explains and opposite to the force of the car on the trailer,
why the trailer moves? the total of all forces acting on the car are
unbalanced.
Select one:
a. The car exerts a larger force on the
trailer than the trailer does on the car.
b. The action-reaction pair is in the
linkage, which pulls the trailer with
larger force than that with which it
pulls the car.
c. 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.
d. The trailer will not move.
A Ferris wheel having a radius of 8 m b. No the Ferris wheel is not moving too fast.
has a velocity of 8 m / s. Is there a
danger of the riders flying off?
Select one:
a. Yes, the Ferris wheel is moving too
fast
b. No the Ferris wheel is not moving
too fast.
c. Possibly. It depends on the density
of the air.
d. Possibly. It depends on the cross
section of the riders.
