Exam 2 Questions from Canvas

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Apr 3, 2024

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PHYS 211-300K Spring 2021 Exam 2 Part 1 Student values for quantities are assigned within the Canvas quiz. In these questions, those assigned values are represented by a variable inside brackets such as [m]-kg where m is the mass value in kilograms. Question #1 Alternative 1 [3 pts] An object’s velocity cannot be zero when acted on by a non-zero net external force. ○ True ○ False Alternative 2 [3 pts] An object’s velocity must be changing when acted on by a non-zero net external force. ○ True ○ False Question #2 Alternative 1 [5 pts] Two mules pull with equivalent (same magnitude and direction) forces on identical carts filled with iron ore. Mule A pulls on cart A and Mule B pulls on cart B. Cart A has a total mass of 20 kg. Cart B has a total mass of 30 kg. ○The acceleration of Cart A is greater than the acceleration of Cart B. ○ The acceleration of Cart A is less than the acceleration of Cart B. ○ The accelerations of Cart A and B are equal. ○ There is not enough information to answer the question asked. Alternative 2 [5 pts] Two mules pull with equivalent (same magnitude and direction) forces on identical carts filled with iron ore. Mule A pulls on cart A and Mule B pulls on cart B. Cart A has a total mass of 25 kg. Cart B has a total mass of 30 kg. ○The acceleration of Cart A is greater than the acceleration of Cart B. ○The acceleration of Cart A is less than the acceleration of Cart B. ○The accelerations of Cart A and B are equal. ○There is not enough information to answer the question asked.

Alternative 3 [5 pts] Two mules pull with equivalent (same magnitude and direction) forces on identical carts filled with iron ore. Mule A pulls on cart A and Mule B pulls on cart B. Cart A has a total mass of 30 kg. Cart B has a total mass of 25 kg. ○ The acceleration of Cart A is greater than the acceleration of Cart B. ○ The acceleration of Cart A is less than the acceleration of Cart B. ○ The accelerations of Cart A and B are equal. ○There is not enough information to answer the question asked. Alternative 4 [5 pts] Two mules pull with equivalent (same magnitude and direction) forces on identical carts filled with iron ore. Mule A pulls on cart A and Mule B pulls on cart B. Cart A has a total mass of 30 kg. Cart B has a total mass of 20 kg. ○ The acceleration of Cart A is greater than the acceleration of Cart B. ○ The acceleration of Cart A is less than the acceleration of Cart B. ○ The accelerations of Cart A and B are equal. ○ There is not enough information to answer the question asked. Alternative 5 [5 pts] Two mules pull with equivalent (same magnitude and direction) forces on identical carts filled with iron ore. Mule A pulls on cart A and Mule B pulls on cart B. Cart A has a total mass of 10 kg. Cart B has a total mass of 15 kg. ○ The acceleration of Cart A is greater than the acceleration of Cart B. ○ The acceleration of Cart A is less than the acceleration of Cart B. ○ The accelerations of Cart A and B are equal. ○ There is not enough information to answer the question asked. Alternative 6 [5 pts] Two mules pull with equivalent (same magnitude and direction) forces on identical carts filled with iron ore. Mule A pulls on cart A and Mule B pulls on cart B. Cart A has a total mass of 15 kg. Cart B has a total mass of 10 kg. ○ The acceleration of Cart A is greater than the acceleration of Cart B. ○ The acceleration of Cart A is less than the acceleration of Cart B. ○ The accelerations of Cart A and B are equal. ○ There is not enough information to answer the question asked.

Alternative 7 [5 pts] Two mules pull with equivalent (same magnitude and direction) forces on identical carts filled with iron ore. Mule A pulls on cart A and Mule B pulls on cart B. Cart A has a total mass of 15 kg. Cart B has a total mass of 25 kg. ○ The acceleration of Cart A is greater than the acceleration of Cart B. ○ The acceleration of Cart A is less than the acceleration of Cart B. ○ The accelerations of Cart A and B are equal. ○ There is not enough information to answer the question asked. Question #3 Alternative 1 [6 pts] Three geese pull on the vines of a gourd. Goose A pulls to the right with [F1] N. Goose B pulls to the left with [F2] N. Goose C pulls to the left with [F3] N. What is the magnitude of the net force on the gourd in newtons? Show your formula and answer in your assignment upload. Alternative 2 [6 pts] Three geese pull on the vines of a gourd. Goose A pulls to the right with [F1] N. Goose B pulls to the right with [F2] N. Goose C pulls to the left with [F3] N. What is the magnitude of the net force on the gourd in newtons? Show your formula and answer in your assignment upload. Alternative 3 [6 pts] Three geese pull on the vines of a gourd. Goose A pulls to the right with [F1] N. Goose B pulls to the left with [F2] N. Goose C pulls to the right with [F3] N. What is the magnitude of the net force on the gourd in newtons? Show your formula and answer in your assignment upload. Question #4 Alternative 1 [6 pts] A slippery seabream swims forward with an acceleration of [a] m/s 2 under the influence of a [F]-N net external force. What is the mass of the sea bream in kilograms? Show your formula and answer in your assignment upload. Alternative 2 [6 pts] A [m]-kg super squid swims in a straight line under the influence of a [F]-N net external force. What is the acceleration of the squid in m/s 2 ? Show your formula and answer in your assignment upload.

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Question #5 [5 pts] Marvin Mosquito collides with a 1500-lb car. During the collision ○ the magnitude of the force on Marvin due to the collision is slightly greater than the magnitude of the force on the car. ○ the magnitude of the force on Marvin due to the collision is exactly equal to the magnitude of the force on the car. ○ the magnitude of the force on the car due to the collision is much greater than the magnitude of the force on Marvin. ○ the car and Marvin have the same magnitude acceleration. Question #6 What is the weight of a [m]-kg person on the surface of a planet where the acceleration due to gravity is [g] m/s 2 ?

PHYS 211-300K Spring 2021 Exam 2 Part 2 Reminder: Student values for quantities are assigned within the Canvas quiz. In these questions, those assigned values are represented by a variable inside brackets such as [m]-kg where m is the mass value in kilograms. Question #1 and #2 Alternative 1 1. [6 pts] Three forces act on a space snake. The space snake moves with constant velocity. The first force is [F1] N directly toward Polaris. The second force is [F2] N directly away from Polaris. What is the magnitude of the third force in newtons? Show your formula(s) and answer in your assignment upload. 2. [2 pts] What is the direction of the third force on the space snake in the previous question? A. Directly toward Polaris B. Directly away from Polaris Alternative 2 1. [6 pts] Three forces act on a space snake. The space snake moves with constant velocity. The first force is [F1] N toward the Sun. The second force is [F2] N toward the Sun. What is the magnitude of the third force in newtons? Show your formula(s) and answer in your assignment upload. 2. [2 pts] What is the direction of the third force on the space snake in the previous question? A. Directly toward the Sun B. Directly away from the Sun Question #3 [20 pts] A [m]-kg hovercraft is stalled in the middle of a horizontal road. You and your friends offer to push the hovercraft off to the side of the road. The coefficient of kinetic friction between the hovercraft and the road is [mu]. What is the magnitude of the force in newtons you and your friends need to push horizontally on the hovecraft to keep it moving at a constant velocity once it has started to move? Show your formula(s), calculations, and answer in your assignment upload. Question #4 [13 pts] Two forces push on [m]-kg Sal the Sabretooth that has been mounted for display to transport it to its stage in a museum. The first force is [F1] N at 0 ○ . The second force is [F2] N at [q] ○ . What is the magnitude of Sal’s acceleration in m/s 2 ? Report your answer to the 1/100th place (example 0.12). Show your formula(s), calculations, and answer in your assignment upload.

Question #5 [10 pts] [m]-kg Star the spacedog is out on a spacewalk to repair a solar panel on the space station when Star throws a [m2]-kg hammer directly away from herself. The hammer accelerates at [a] m/s 2 during the throw. What is the magnitude of the acceleration of Star during the throw? Show your formula(s), calculations, and answer in your assignment upload. Question #6 [14 pts] The wind exerts a [F1]-N force on a [m]-kg sailboat. The water exerts a [F2]-N drag force in the opposite direction on the sailboat. The sailboat starts from rest. What is the speed in m/s of the sailboat [t] seconds later? Show your formula(s) and answer in your assignment upload. Question #7 [5 pts] A toy rolls along a floor at constant speed. The coefficient of rolling friction between the toy and the floor is [r]. The coefficient of kinetic friction between the toy and the floor is [k]. The friction force on the toy by the floor has a magnitude of [f] N? What is the magnitude of the normal force in newtons of the floor acting on the toy? Show your formula(s) and answer in your assignment upload.

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