9:53 076_Mome... Momentum Practice Problems (from Giancoli Textbook) 7. (II) A child in a boat throws...
Fantastic news! We've Found the answer you've been seeking!
Question:
![image text in transcribed](https://s3.amazonaws.com/si.experts.images/answers/2024/05/6650759872aca_0166650759858f13.jpg)
Transcribed Image Text:
9:53 076_Mome... Momentum Practice Problems (from Giancoli Textbook) 7. (II) A child in a boat throws a 5.30-kg package out horizon- tally with a speed of 10.0 m/s, Fig. 7-31. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 24.0 kg and the mass of the boat is 35.0 kg. 11. (II) A 22-g bullet traveling 240 m/s penetrates a 2.0-kg block of wood and emerges going 150 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges? 13. (III) Air in a 120-km/h wind strikes head-on the face of a building 45 m wide by 75 m high and is brought to rest. If air has a mass of 1.3 kg per cubic meter, determine the average force of the wind on the building. 16. (II) A golf ball of mass 0.045 kg is hit off the tee at a speed of 38 m/s. The golf club was in contact with the ball for 3.5 x 103 s. Find (a) the impulse imparted to the golf ball, and (b) the average force exerted on the ball by the golf club. 24. (III) (a) Calculate the impulse experienced when a 55-kg person lands on firm ground after jumping from a height of 2.8 m. (b) Estimate the average force exerted on the person's feet by the ground if the landing is stiff-legged, and again (c) with bent legs. With stiff legs, assume the body moves 1.0 cm during impact, and when the legs are bent, about 50 cm. [Hint: The average net force on him, which is related to impulse, is the vector sum of gravity and the force exerted by the ground. See Fig. 7-34.] We will see in Chapter 9 that the force in (b) exceeds the ultimate strength of bone (Table 9-2). mg grd FIGURE 7-34 Problem 24. 51. (II) The CM of an empty 1250-kg car is 2.40 m behind the front of the car. How far from the front of the car will the CM be when two people sit in the front seat 2.80 m from the front of the car, and three people sit in the back seat 3.90 m from the front? Assume that each person has a mass of 65.0 kg. 63. (II) A 52-kg woman and a 72-kg man stand 10.0 m apart on nearly frictionless ice. (a) How far from the woman is their CM? (b) If each holds one end of a rope, and the man pulls on the rope so that he moves 2.5 m, how far from the woman will he be now? (c) How far will the man have moved when he collides with the woman? 66. (III) A huge balloon and its gondola, of mass M, are in the air and stationary with respect to the ground. A passenger, of mass m, then climbs out and slides down a rope with speed v, measured with respect to the balloon. With what speed and direction (relative to Earth) does the balloon then move? What happens if the passenger stops? An explosive cannon ball is launched at an initial speed of v at an angle above the ground. The cannon was aimed correctly to hit a target a distance R away. a) Determine the speed of the half of the cannon ball which is flung forward. b) When the ball was half-way through its flight, it exploded prematurely into two identical halves. One half was thrown backwards, landing exactly on the cannon which fired it. How far away (in terms of R) did the other half land from its original target. c) Justify that your answer for part (b) is true no matter where in the flight of the cannon ball the explosion occurred. 9:53 076_Mome... Momentum Practice Problems (from Giancoli Textbook) 7. (II) A child in a boat throws a 5.30-kg package out horizon- tally with a speed of 10.0 m/s, Fig. 7-31. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 24.0 kg and the mass of the boat is 35.0 kg. 11. (II) A 22-g bullet traveling 240 m/s penetrates a 2.0-kg block of wood and emerges going 150 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges? 13. (III) Air in a 120-km/h wind strikes head-on the face of a building 45 m wide by 75 m high and is brought to rest. If air has a mass of 1.3 kg per cubic meter, determine the average force of the wind on the building. 16. (II) A golf ball of mass 0.045 kg is hit off the tee at a speed of 38 m/s. The golf club was in contact with the ball for 3.5 x 103 s. Find (a) the impulse imparted to the golf ball, and (b) the average force exerted on the ball by the golf club. 24. (III) (a) Calculate the impulse experienced when a 55-kg person lands on firm ground after jumping from a height of 2.8 m. (b) Estimate the average force exerted on the person's feet by the ground if the landing is stiff-legged, and again (c) with bent legs. With stiff legs, assume the body moves 1.0 cm during impact, and when the legs are bent, about 50 cm. [Hint: The average net force on him, which is related to impulse, is the vector sum of gravity and the force exerted by the ground. See Fig. 7-34.] We will see in Chapter 9 that the force in (b) exceeds the ultimate strength of bone (Table 9-2). mg grd FIGURE 7-34 Problem 24. 51. (II) The CM of an empty 1250-kg car is 2.40 m behind the front of the car. How far from the front of the car will the CM be when two people sit in the front seat 2.80 m from the front of the car, and three people sit in the back seat 3.90 m from the front? Assume that each person has a mass of 65.0 kg. 63. (II) A 52-kg woman and a 72-kg man stand 10.0 m apart on nearly frictionless ice. (a) How far from the woman is their CM? (b) If each holds one end of a rope, and the man pulls on the rope so that he moves 2.5 m, how far from the woman will he be now? (c) How far will the man have moved when he collides with the woman? 66. (III) A huge balloon and its gondola, of mass M, are in the air and stationary with respect to the ground. A passenger, of mass m, then climbs out and slides down a rope with speed v, measured with respect to the balloon. With what speed and direction (relative to Earth) does the balloon then move? What happens if the passenger stops? An explosive cannon ball is launched at an initial speed of v at an angle above the ground. The cannon was aimed correctly to hit a target a distance R away. a) Determine the speed of the half of the cannon ball which is flung forward. b) When the ball was half-way through its flight, it exploded prematurely into two identical halves. One half was thrown backwards, landing exactly on the cannon which fired it. How far away (in terms of R) did the other half land from its original target. c) Justify that your answer for part (b) is true no matter where in the flight of the cannon ball the explosion occurred.
Expert Answer:
Posted Date:
Students also viewed these physics questions
-
If an object is dropped from a height h, then the time t required for the object to strike the ground is directly proportional to the square root of h. If it requires 1 second for an object to fall...
-
Use statistical software to calculate the t-statistic and p-value for the hypothesis tests H0: 1 = 0 versus Ha: 1 0. In addition, construct a 95% confidence interval for 1. Based on these...
-
(LO 6-4) How do sparklines help the reader quickly grasp what happened? When might they be more useful than a table of figures or a bigger graph?
-
How can information systems support the manufacturing process?
-
1. What were the external and internal forces for change at HCL? 2. To what extent did Vineet Nayar follow the change models proposed by Lewin and Kotter? 3. Which of the target elements of change...
-
In CAPM (Capital Asset Pricing Model) framework, the beta coefficient is associated with the risk of an individual stock. List all the following statements that are TRUE: 1. Beta greater than 0 means...
-
essories. For the year, the gloves and mittens 0, and fixed expenses of $149,000. Therefore, Gator eliminates the line, $42,000 of fixed any should eliminate the gloves and mittens ive sign preceding...
-
Farlow Inc. has the following projected sales for the next four months: At March 31, 2,148 units of finished goods are expected in inventory. Farlows finished goods inventory policy is to have 60...
-
The following information is available for Revelle Company. Sales price per unit is \($80.\) November and December, sales were budgeted at 3,100 and 3,550 units, respectively. Variable costs are...
-
Wright Company makes 75 percent of its sales in cash. Credit sales are collected as follows: 65 percent in the month of sale and 35 percent in the month following the sale. Wrights budgeted sales for...
-
Two parallel conducting plates are \(0.10 \mathrm{~m}\) apart and carry equal and opposite charges. They are large enough relative to the \(0.10-\mathrm{m}\) separation distance that we can assume...
-
Nambe Clay, Inc., produces clay products for art in elementary school art programs. The company's flexible budget income statement for January 2009 shows output levels of \(55,000,60,000\), and...
-
1. Explain the importance of sales in business. 2. Explain the importance of intellectual property 3. Explain the importance of agency in busines 4. Explain the importance of pledge, mortgage and...
-
According during to the IRS, individuals filing federal income tax returns prior to March 31 received an average refund of $1,088 in 2018. Consider the population of "last-minute" filers who mail...
-
List four methods used to estimate sales for budgeting purposes.
-
What are the relationships between organization goals, strategic plans, and a master budget for the coming period?
-
For governmental agencies, a budget is also a legal limitation on expenditures. If governmental employees are asked about their agencies' needs for the coming fiscal period, what types of biases are...
![Mobile App Logo](https://dsd5zvtm8ll6.cloudfront.net/includes/images/mobile/finalLogo.png)
Study smarter with the SolutionInn App