Askater of mass 40 kg is carrying a box of mass 5 kg. the skater has a speed of 5 m/s with respect to the floor and is gliding without any friction on a smooth surface. a. find the momentum of the box with respect to the floor. b. find the momentum of the box with respect to the floor after she puts the box down on the frictionless skating surface.
Solved
Show answers
More tips
- F Family and Home Daughter says: If you don t want to do it, don t do it. Should we persuade her?...
- H Health and Medicine How Did Inna Lose Weight on Dom 2?...
- H Health and Medicine Coughing: Causes, Types, and Treatment Methods...
- H Health and Medicine How to Treat the Flu: A Comprehensive Guide...
- O Other What is a Disk Emulsifier and How Does it Work?...
- F Family and Home What does a newborn need?...
- F Family and Home Choosing the Right Car Seat for Your Child: Tips and Recommendations...
- F Food and Cooking How to Get Reconfirmation of Registration?...
- C Computers and Internet How to Get Rid of Spam in ICQ?...
- A Art and Culture Who Said The Less We Love a Woman, the More She Likes Us ?...
Answers on questions: Physics
- P Physics A force of 355 N is applied to an object that accelerates at a rate of 7.8 m/sec2 . What is the mass of the object ?...
- P Physics Two charges are placed 0.100 m apart from each other and experience a force of 100 N. Which statement about the electric force is correct for what happens if both charges...
- P Physics a solenoid that is 98.6 cm long has a cross-sectional area of 24.3 cm2. There are 1310 turns of a wire carrying a current of...
- P Physics You are a doctor and jack is your patient. jack wants to know about his overall health. what is the best thing you can do to jack understand his overall health? determine...
- P Physics Aball is thrown straight down with a velocity of 19.6m/s what will be its velocity 2.0s after being released...
- P Physics A40-kg soccer player going through the air at 4m/s collides with a 60-kg player who is headed toward her at 3m/s, in the air. what is the speed and direction of the entangled...
- S Social Studies What transform brazil into a major oil exporter? . . nationalizing the oil companies. turning sugar into biofuel. an offshore oil discovery. its close relationship with venezuela....
- H History How did railroads promote the growth of north carolina’s textile industry? check all that apply 1) they allowed workers to commute into the cities 2) they transported raw...
- M Mathematics What is the answer to theses 5th grade math probs br / br / 1. 4.9 ÷ 7 = br / br / 2. 3.6 ÷ 9 = br / br / 3. 2.4 ÷ 8 = br / br / 4. 6.48 ÷ 4 = br / br / 5. 3.01 ÷ 7 = br /...
- H History Why doesn’t the us have a unitary form of government...
Ответ:
For the part a) we need only the momentum of the box and we have the data to find it.
Momentum is given by,
where clearly, p is the momentum, m the mass of the box and v is the velocity.
Substituting,
For part b) we need an analysis of the situation. We understand that the box on a surface that has no friction will continue to rotate at the same speed previously defined. The box can only stop with friction, so,
It is the same that part a)
Ответ:
D
Explanation: Six people can push with more force than 5 people can. So, if 5 people can push the box up a 400-cm ramp, then certainly 6 people can do it also. Similarly, any ramp that is longer (less steep) than a 400-cm ramp will work, so they can handle the 800-cm ramp. However, the 200-cm ramp is too short and steep. In fact, the 200-cm ramp is half the distance of the 400-cm ramp, so it would take twice as many people (10 people) to push the box up that ramp. Six people is not enough