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单选题 Only nonconservative forces can change the kinetic energy of an object

A. √

B. ×

学科：Physical Modelling A

时间：2025-03-25 07:18:07

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题目1
单选题
A 1500-kg car moving at 20m/s crosses the rounded top of a hill (treat as an arc of circle, radius 100m). What is the normal force N acted by the hill? (g=9.80m/s^2) N = _________ N
A. 870B. 87C. 8700D. 8.7
题目2
单选题
<img src="https://tihai-oss-cloud.itihey.com/img/95a45cc8d5d34ac08808120bdd8060cf.png"> <img src="https://tihai-oss-cloud.itihey.com/img/8296f722c90c33ed8724c0dbd0f33483.png">
A. 10B. 7.3C. 12.6D. 73
题目3
单选题
A conical pendulum composed of a massless rope (length L) and a bob (mass m) is shown in Figure. How much is the period for the pendulum? <img src="https://tihai-oss-cloud.itihey.com/img/cbe8587bb6d92d5b4a8e3eac8429760e.png">
A. <img src="https://tihai-oss-cloud.itihey.com/img/0be7dce1b91779b467ccbd8fc2e25bd9.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/62973bf50b92d924f8ce8a0aae16d4d4.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/69c57944ba8f3a4e7a71333e03f037be.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/09a8449ab755f272aa481badb8eebc3a.png">
题目4
单选题
Newton's laws can be used in any reference frame
A. &radic;B. &times;
题目5
单选题
The kinetic energy of an object depends on the reference frame in which its motion is measured
A. &radic;B. &times;
题目6
单选题
A force acting on an object does no work on it, if the force is always perpendicular to the moving direction of object
A. &radic;B. &times;
题目7
单选题
Only nonconservative forces can change the kinetic energy of an object
A. &radic;B. &times;
题目8
单选题
The total momentum of a system remains constant in any case
A. &radic;B. &times;
题目9
单选题
If there is an elastic collision between two objects, their total kinetic energy will not change
A. &radic;B. &times;
题目10
单选题
A particle is suspended from a post on top of a cart by a light string as shown in Figure. The cart and particle are initially moving to the right at constant speed v, with the string vertical. The cart suddenly comes to rest when it runs into and sticks to a bumper. Which of the following statements is true about the collision process? <img src="https://tihai-oss-cloud.itihey.com/img/bd23acc8e612ec2412ac09d498140191.png">
A. The linear momentum of the cart is conservedB. The linear momentum of the particle is conservedC. The linear momentum of the cart and linear momentum of the particle are both conservedD. The linear momentum of the cart and linear momentum of the particle are both not conserved
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