1|Page
PHY250 final exam Questions and
Answers 100% Pass
Given the vectors 𝐶→=2𝑖̂ +7𝑗̂ →=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∘ - ✔✔b. 𝜃= 4∘
A spider lowers herself on a single strand of silk at constant speed. 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.
Author: Katelyn Whitman. ©2025, All Rights Reserved.
, 2|Page
d.The tension in the silk is less than the spider's weight. - ✔✔d.The tension in the silk is less than the
spider's weight.
Given the vectors 𝐴→=6𝑖̂ +3𝑗̂ �→=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 - ✔✔d. 𝐴→⋅𝐵→ = 33
Which is the definition of a derived 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. - ✔✔c. A unit which is based on other
(basic) units.
Torque is given by the formula, 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?
Author: Katelyn Whitman. ©2025, All Rights Reserved.
, 3|Page
Select one:
a. 0 N⋅m
b. 40.8 N⋅m
c. 0.41 N⋅m
d. 4.1 N⋅m - ✔✔c. 0.41 N⋅m
When a small car pulls a trailer for a move, which of the following explains why the trailer moves?
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. - ✔✔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.
A Ferris wheel having a radius of 8 m 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.
Author: Katelyn Whitman. ©2025, All Rights Reserved.
, 4|Page
c. Possibly. It depends on the density of the air.
d. Possibly. It depends on the cross section of the riders. - ✔✔b. No the Ferris wheel is not moving too
fast.
A 3.5 kg object is placed on a frictionless incline as shown in the diagram. The object's initial velocity is
zero and it starts to slide down the incline. What are the acceleration and final velocity of the object when
it reaches the ground level?
Select one:
a. a = 5.6 m / s2v = 8.9 m / s
b. a = 2.1 m / s2v = 14 m / s
c. a = 3.3 m / s2v = 21 m / s
d. a = 1.0 m / s2v = 17 m / s
e. None of the above - ✔✔a. a = 5.6 m / s2v = 8.9 m / s
If the formula for work is given by 𝑊= 𝐹→⋅𝑑→, how much work is done by 60 N force which is applied
as 25∘25∘ with respect to the 13 m displacement?
Select one:
a. 0 N⋅m
b. 330 N⋅m
c. 707 N⋅m
d. 780 N⋅m - ✔✔c. 707 N⋅m
Author: Katelyn Whitman. ©2025, All Rights Reserved.
PHY250 final exam Questions and
Answers 100% Pass
Given the vectors 𝐶→=2𝑖̂ +7𝑗̂ →=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∘ - ✔✔b. 𝜃= 4∘
A spider lowers herself on a single strand of silk at constant speed. 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.
Author: Katelyn Whitman. ©2025, All Rights Reserved.
, 2|Page
d.The tension in the silk is less than the spider's weight. - ✔✔d.The tension in the silk is less than the
spider's weight.
Given the vectors 𝐴→=6𝑖̂ +3𝑗̂ �→=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 - ✔✔d. 𝐴→⋅𝐵→ = 33
Which is the definition of a derived 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. - ✔✔c. A unit which is based on other
(basic) units.
Torque is given by the formula, 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?
Author: Katelyn Whitman. ©2025, All Rights Reserved.
, 3|Page
Select one:
a. 0 N⋅m
b. 40.8 N⋅m
c. 0.41 N⋅m
d. 4.1 N⋅m - ✔✔c. 0.41 N⋅m
When a small car pulls a trailer for a move, which of the following explains why the trailer moves?
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. - ✔✔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.
A Ferris wheel having a radius of 8 m 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.
Author: Katelyn Whitman. ©2025, All Rights Reserved.
, 4|Page
c. Possibly. It depends on the density of the air.
d. Possibly. It depends on the cross section of the riders. - ✔✔b. No the Ferris wheel is not moving too
fast.
A 3.5 kg object is placed on a frictionless incline as shown in the diagram. The object's initial velocity is
zero and it starts to slide down the incline. What are the acceleration and final velocity of the object when
it reaches the ground level?
Select one:
a. a = 5.6 m / s2v = 8.9 m / s
b. a = 2.1 m / s2v = 14 m / s
c. a = 3.3 m / s2v = 21 m / s
d. a = 1.0 m / s2v = 17 m / s
e. None of the above - ✔✔a. a = 5.6 m / s2v = 8.9 m / s
If the formula for work is given by 𝑊= 𝐹→⋅𝑑→, how much work is done by 60 N force which is applied
as 25∘25∘ with respect to the 13 m displacement?
Select one:
a. 0 N⋅m
b. 330 N⋅m
c. 707 N⋅m
d. 780 N⋅m - ✔✔c. 707 N⋅m
Author: Katelyn Whitman. ©2025, All Rights Reserved.
