Download presentation

Presentation is loading. Please wait.

1
**Q07. Conservation of Energy**

2
A 0.20-kg particle moves along the x-axis under the influence of a stationary object. The potential energy is given by : U(x) = (8.0 J/m2) x2 + (2.0 J/m4) x4 where x is in coordinate of the particle. If the particle has a speed of 5.0 m/s when it is at x = 1.0 m, its speed when it is at the origin is: 2.5 m/s 5.7 m/s 7.9 m/s 11 m/s <PowerClick><Answer>5</Answer><Option>5</Option></PowerClick>

3

4
A 2.2-kg block starts from rest on a rough inclined plane that makes an angle of 25° with the horizontal. The coefficient of kinetic friction is As the block goes 2.0 m down the plane, the mechanical energy of the Earth-block system changes by: –9.8 J 9.8 J –4.6 J 4.6 J <PowerClick><Answer>2</Answer><Option>5</Option></PowerClick>

5
= 0.25 2.2 kg 25

6
A block of mass m is initially moving to the right on a horizontal frictionless surface at a speed v. It then compresses a spring of spring constant k At the instant when the kinetic energy of the block is equal to the potential energy of the spring, the spring is compressed a distance of: (1/4) m v2 m v2 / 4k <PowerClick><Answer>1</Answer><Option>5</Option></PowerClick>

8
**A 700-N man jumps out of a window into a fire net 10 m below**

A 700-N man jumps out of a window into a fire net 10 m below. The net stretches 2 m before bringing the man to rest and tossing him back into the air. The maximum potential energy of the net, compared to it's unstretched potential energy, is: 300 J 710 J 850 J 7000 J 8400 J <PowerClick><Answer>5</Answer><Option>5</Option></PowerClick>

9
10 m 2 m

10
**A toy cork gun contains a spring whose spring constant is 10. 0 N/m**

A toy cork gun contains a spring whose spring constant is 10.0 N/m. The spring is compressed 5.00 cm and then used to propel a 6.00-g cork. The cork, however, sticks to the spring for 1.00 cm beyond its unstretched length before separation occurs. The muzzle velocity of this cork is: 6.32 m/s 1.63 m/s 2.00 m/s 2.08 m/s 2.45 m/s <PowerClick><Answer>3</Answer><Option>5</Option></PowerClick>

11
5cm 1cm

12
A small object of mass m, on the end of a light cord, is held horizontally at a distance r from a fixed support as shown. The object is then released. What is the tension in the cord when the object is at the lowest point of its swing? m g / 2 m g 2 m g 3 m g m g r <PowerClick><Answer>4</Answer><Option>5</Option></PowerClick>

13
T mg

14
A small object of mass m starts at rest at the position shown and slides along the frictionless loop-the-loop track of radius R. What is the smallest value of y such that the object will slide without losing contact with the track ? R /4 R /2 R 2 R zero <PowerClick><Answer>2</Answer><Option>5</Option></PowerClick>

15

16
A ball of mass m, at one end of a string of length L, rotates in a vertical circle just fast enough to prevent the string from going slack at the top of the circle. The speed of the ball at the bottom of the circle is: <PowerClick><Answer>4</Answer><Option>5</Option></PowerClick>

17
At top, T = 0 : E Conservation :

18
**its mechanical energy is a minimum the forces on it are balanced **

A rectangular block is moving along a frictionless path when it encounters the circular loop as shown. The block passes points 1,2,3,4,1 before returning to the horizontal track. At point 3: its mechanical energy is a minimum the forces on it are balanced it is not accelerating its speed is a minimum it experiences a net upward force <PowerClick><Answer>4</Answer><Option>5</Option></PowerClick>

19
**its mechanical energy is a minimum**

the forces on it are balanced it is not accelerating its speed is a minimum it experiences a net upward force

Similar presentations

OK

Hour Exam 2 Review 9:00 Exam is Tomorrow (Wednesday) at 7:00 pm.

Hour Exam 2 Review 9:00 Exam is Tomorrow (Wednesday) at 7:00 pm.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on phonetic transcription chart Ppt on gender inequality in education Ppt on bmc remedy change Ppt on six sigma green belt Ppt on maggi in india Ppt on linear equations in two variables Ppt on elections in india download Ppt on number system for class 10th Ppt on multi sectoral approach on ncds Ppt on limitation act 1939