PHY 250 General Physics I All Exams Questions and Answers Latest 2023/2024 – StraighterLine (GRADED). What is the acceleration of a skydiver at terminal velocity whose mass is 80 kg and cross-sectional area is 14 m . The density of the air he is falling
through is 0.9984 g / m . The drag coe_c...
PHY 250 General Physics I All Exams Questions and Answers Latest 2023/2024 – StraighterLine (GRADED) Question 1
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Question 2
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Question 3
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6.00 points outof 6.00What is the acceleration of a skydiver at terminal velocity whose mass is 80 kg and cross-sectional area is 14 m . The density of the air he is falling
through is 0.9984 g / m . The drag coe_cient has a value of 0 .485.
Select one:
a. 15.2 m / sec
b. 56.4 m / sec
c. 0 m / sec d. 481 m / sec
e. None of the above
The correct answer is: 0 m / sec
Calculate , where v = 0.227 m/s, t = 11.1s, and .
Select one:
a. 606.2487 m
b. 606 m
c. 605.5 m
d. 606.249 m The correct answer is: 606 m
Which of the following statements concerning an object in free fall through the atmosphere is incorrect?
Select one:
a. Air resistance opposes the motion of an object moving through air and exists because a moving object collides with air molecules.
b. The speed of a falling object increases due to the frictional force of air drag. c. Given two spherical objects made of the same material and dropped from the same height, the one with the larger cross-sectional area will
experience increased air resistance.
d. When the magnitude of the air drag equals that of the object's weight, the net force on the object is zero. The object then falls with amaximum constant velocity called the terminal velocity.
The correct answer is: The speed of a falling object increases due to the frictional force of air drag.23
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2
2
2
2
x = vt +a12t2 a = 9.80 m/s2 Question 4
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Question 5
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Question 7
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6.00 points outof 6.00A woman drives 2 blocks north, stops, continues on for another 4 .5 blocks, and then makes a U-turn and drives south 3 .25 blocks. After stoppingmomentarily she drives 5.75 blocks north. Which of the following is the magnitude of the woman’s displacement and distance traveled?
Select one:
a. Displacement: 15.5 blocks
Distance: 15.5 blocks
b. Displacement: 15.5 blocks
Distance: 9 blocks
c. Displacement: 9 blocks
Distance: 15.5 blocks d. Displacement: 9 blocks
Distance: 9 blocks
The correct answer is: Displacement: 9 blocks
Distance: 15.5 blocks
Which of the following is a correct statement concerning the velocity of a particle in uniform circular motion?
Select one:
a. The velocity is in the same direction as the angular velocity.
b. The velocity is directed radially inward.
c. The velocity is in the same direction as the centripetal acceleration.
d. The velocity is constantly changing directions. The correct answer is: The velocity is constantly changing directions.
Why is Select one:
a. It isn’t.
b. All the cross-terms are equal to zero.
c. The vectors are 90° apart.
d. The vectors are pointing in the same direction. The correct answer is: All the cross-terms are equal to zero.
An airplane travels 600 m down a runway for take off. It starts from rest and moves with constant acceleration. It is in the air in 23 s. What is itsspeed when it takes off?
Select one:
a. 7.2 m / s
b. 2.3 m / s
c. 52 m / s d. There is not enough information provided to answer the question.
The correct answer is: 52 m / s⋅=+A→B→AxBxAyBy Question 8
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Question 9
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Question 10
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Question 11
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6.00 points outof 6.00Two children are playing catch in a passenger train. An observer on the ground measures that the train is traveling at 70 mph. As the train passesthe observer, he measures that the ball is thrown with half of the speed as the passenger train. What velocity do the children measure for the ball?(Assume the positive direction is the direction in which the train is moving.)
Select one:
a. −105 mph
b. −70 mph
c. −35 mph d. 105 mph
The correct answer is: −35 mph
What is the scalar product of two perpendicular vectors?
Select one:
a. the total of their magnitudes
b. the product of their magnitudes
c. zero d. the difference of their magnitudes
The correct answer is: zero
An airplane has an initial velocity with respect to the ground of 200 mph in an eastward direction. A strong wind begins to blow with a velocity of 80mph from north to south. What are the x-and y-components of the total velocity of the plane when the wind is taken into account? Let north be thepositive y-direction and east be the positive x-direction.
Select one:
a. v = +200 mph
v = +80 mph
b. v = +200 mph
v = −80 mph c. v = +80 mph
v = +200 mph
d. v = +215 mphv = −80 mph
The correct answer is: v = +200 mphv = −80 mph
Consider a basket with 3.046 kg of fruit. When you weigh the whole package (fruit + basket), the reading on the scale is 4 .2 kg. What is the mostrealistic weight of the basket alone?
Select one:
a. 1.2 kg b. 1.154 kg
c. 1.15 kg
d. 1 kg
The correct answer is: 1.2 kgxy
xy
xy
xy
xy
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