50.0 m/s- QUESTION 4 Same rocket as in the previous question. After the rocket has been in flight for a while, having burned and exhausted 80,000 kg of propellant, its acceleration has reached 25.0 m/s-. All this while the thrust has been constant at 5.00 x 10° N. What is the magnitude of the drag force (that is, the resistance from the air) at this point? Note that at this point the rocket's altitude is still low, so you can still take gravity to be g = 9.81 m/s2 3.00 x 106 N 1.18 x 106 N 8.23 x 105 N 5.00 x 106 N QUESTION 5 A falling body on Earth will generally not fall at constant acceleration in reality, due to air resistance (or drag). The equation for the drag force Fd is Click Save and Submit to save and submit. Click Save All Answers to save all answers. Sav

50.0 m/s- QUESTION 4 Same rocket as in the previous question. After the rocket has been in flight for a while, having burned and exhausted 80,000 kg of propellant, its acceleration has reached 25.0 m/s-. All this while the thrust has been constant at 5.00 x 10° N. What is the magnitude of the drag force (that is, the resistance from the air) at this point? Note that at this point the rocket's altitude is still low, so you can still take gravity to be g = 9.81 m/s2 3.00 x 106 N 1.18 x 106 N 8.23 x 105 N 5.00 x 106 N QUESTION 5 A falling body on Earth will generally not fall at constant acceleration in reality, due to air resistance (or drag). The equation for the drag force Fd is Click Save and Submit to save and submit. Click Save All Answers to save all answers. Sav

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter5: Newton's Law Of Motion

Section: Chapter Questions

Problem 57P: Two teams of nine members each engage in tug-of-war. Each of the first team’s members has an average...

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Review. A block of mass m = 2.00 kg is released from rest at h = 0.500 m above the surface of a table, at the top of a = 30.0 incline as shown in Figure P5.101. The frictionless incline is fixed on a table of height H = 2.00 m. (a) Determine the acceleration of the block as it slides down the incline, (b) What is the velocity of the block as it leaves the incline? (c) How far from the table will the block hit the floor? (d) What time interval elapses between when the block is released and when it hits the floor? (e) Does the mass of the block affect any of the above calculations?
(a) If the rocket sled shown in Figure 4.32 starts with only one rocket burning, what is the magnitude of its acceleration? Assume that the mass of the system is 2100 kg, the thrust T is 2.4104 N, and the force of friction opposing the motion is known to be 650 N. (b) Why is the acceleration not one-fourth of what it is with all rockets burning?
Two teams of nine members each engage in tug-of-war. Each of the first team’s members has an average mass of 68 kg and exerts an average force of 1350 N horizontally. Each of the second team’s members has an average mass of 73 kg and exerts an average force of 1365 N horizontally. (a) What is magnitude of the acceleration of the two teams, and which team sins? (b) What is the tension in the section of rope between the teams?
A weight lifter stands on a bathroom scale. He pumps a barbell up and down. What happens to the reading on the scale as he does so? What If? What if he is strong enough to actually throw the barbell upward? How does the reading on the scale vary now?
On June 25, 1983, shot-putter Udo Beyer of East Germany threw the 7.26-kg shot 22.22 m, which at that time was a world record. (a) If the shot was released at a height of 2.20 m with a projection angle of 45.00, what was its initial velocity? (b) If while in Beyer’s hand the shot was accelerated uniformly over a distance of 1.20 m, what was the net force on it?
A young woman buys an inexpensive used car for stock car racing. It can attain highway speed with an acceleration of 8.40 mi/h s. By making changes to its engine, she can increase the net horizontal force on the car by 24.0%. With much less expense, she can remove material from the body of the car to decrease its mass by 24.0%. (a) Which of these two changes, if either, will result in the greater increase in the cars acceleration? (b) If she makes both changes, what acceleration can she attain?
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A .22 rifle bullet, traveling at 350 m/s, strikes a large tree, which penetrates to a depth of 0.130 m. The mass of the bullet is 1.80 g. Assume constant retarding force. (a) How much time is required for the bullet to stop? (b) What force, in newtons, does the tree exert on the bullet?
1. Consider a plane of mass 50,000 kg in takeoff when the thrust for each of its four engines is 25,000 N. If the plane is facing an air drag force of 10,000 N; What is the acceleration of the plane? 2. Peter, who has a mass of 80 Kg is skateboarding at 5 m/s when he smacks into a brick wall and comes to a dead stop in 0.25 sec. What is his acceleration? What is the force acting on him? 3. A boxer punches a sheet of paper in midair and bring it from rest up to a speed of 20 m/s in in 0.02 sec. Mass of paper is 0.005 Kg. a.What acceleration is imparted to the paper? b.What force does the boxer exert on it? c. What force does the paper exert on the boxer? 4. If you stand next to a wall on a frictionless skateboard and push the wall with a force of 40 N, how hard does the wall push on you? If your mass is 75 Kg, what will be your acceleration? 5. What average net force is required to bring a 1200 kg car to rest from a speed of 25 m/s (90 km/h) in 10 seconds? 6. A 50 Kg toolbox is being…
A 20,000 kg rocket has a rocket motor that generates 3.0 x 105 N of thrust.a. What is the rocket’s initial upward acceleration?b. At an altitude of 5.0 km the rocket’s acceleration hasincreased to 6.0 m/s2. What mass of fuel has it burned?
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