College Physics (10th Edition)
10th Edition
ISBN: 9780321902788
Author: Hugh D. Young, Philip W. Adams, Raymond Joseph Chastain
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 44P
|| A bullet is fired horizontally from a high-powered rifile if air drag is taken into account is the magnitude of the bullet’s acceleration after leaving the barrel greater than or less than g? Explain
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2) A disk (40mm diameter and 0.2 kg mass) is dropped in the air. Consider g
= 10 m/s² and the density of air 1.2 kg/m³. Assume that the drag coefficient of the disk is
1.17. At t=0, the disk speed V = 0.
a)
What is the acceleration and distance when the ball speed reaches to
1/4V₁, where V, is the terminal speed?
b)
What would be the answer for part (a) if the falling object is
hemispherical (40mm diameter and 0.2 kg mass)? Explain
Do it asap
calculate the velocity a spherical rain drop would achieve falling (taking downward as positive) from 4.4 km in the following situations.h = 4.4 kml = 4.2 mmd = 1.15 kg/m3
Calculate the velocity with air drag in m/s. Take the size across of the drop to be 4.2 mm, the density of air to be 1.15 kg/m3, th density of water to be 1000 kg/m3, the surface area to be πr2, and the drag coefficient to be 1.0.
Chapter 5 Solutions
College Physics (10th Edition)
Ch. 5 - Can a body be in equilibrium when only one force...Ch. 5 - A clothesline is hung between two poles, and then...Ch. 5 - A man sits in a seat that is suspended from a...Ch. 5 - You push a box up a frictionless incline at a...Ch. 5 - Why is it so much more difficult to walk on icy...Ch. 5 - A car accelerates gradually to the right with...Ch. 5 - Without doing any calculations, decide whether the...Ch. 5 - A box slides up an incline, comes to rest, and...Ch. 5 - For the objects shown in Figure 5.27, will the...Ch. 5 - A woman is pushing horizontally on two boxes on a...
Ch. 5 - In a world without friction, could you (a) walk on...Ch. 5 - You can classify scales for weighing objects as...Ch. 5 - When you stand with bare feet in a wet bathtub,...Ch. 5 - A horizontal force accelerates a box across a...Ch. 5 - You slide an 800 N table across the kitchen floor...Ch. 5 - A woman wearing spiked shoes pushes two crates...Ch. 5 - A horizontal force with a magnitude P pulls two...Ch. 5 - A crate slides up an inclined ramp and then slides...Ch. 5 - A weightless spring scale is attached to two equal...Ch. 5 - Two objects are connected by a light wire as shown...Ch. 5 - A 100 N weigh: is supported by two weightless...Ch. 5 - The System shown a Figure 5.34 is released from...Ch. 5 - In the system shown in Figure 5.35, M m, the...Ch. 5 - | A 15.0 N bucket is to be raised at a constant...Ch. 5 - | In a museum exhibit, three equal weights are...Ch. 5 - | Two 25.0 N weights are suspended at oppos1te...Ch. 5 - | Two weights are hanging as shown in Figure 5.38....Ch. 5 - | An adventurous archaeologist crosses between two...Ch. 5 - || A 1130 kg car is being pulled up a frictionless...Ch. 5 - || BIO Muscles and tendons. Muscles are attached...Ch. 5 - | BIO Traction apparatus. In order to prevent...Ch. 5 - | BIO A broken thigh bone. When the thigh is...Ch. 5 - || A heavy mirror that has a width of 1 m is to be...Ch. 5 - || In a rescue, the 73 kg police officer is...Ch. 5 - || A tetherball leans against the smooth,...Ch. 5 - Find the tension in each cord in Figure 5.47 if...Ch. 5 - || Two blocks. each with weight w. are held in...Ch. 5 - || A. man pushes on a piano of mass 180 kg 50 that...Ch. 5 - || BIO Forces during chin-ups. People who do...Ch. 5 - || Force on a tennis ball. The record speed for a...Ch. 5 - || BIO Force during a jump. An average person can...Ch. 5 - || Two weights are hanging from the ceiling of an...Ch. 5 - || A large fish hangs from a spring balance...Ch. 5 - || A 750.0 kg boulder is raised from a quarry 125...Ch. 5 - || Which way and by what angle does the...Ch. 5 - | At a construction site, a 22.0 kg bucket of...Ch. 5 - || Two boxes are connected by a light string that...Ch. 5 - | An 80 N box initially at rest is pulled by a...Ch. 5 - | A 2 kg book sits at rest on a horizontal table....Ch. 5 - | At a construction site, a pallet of bricks is to...Ch. 5 - || Two crates connected by a rope of negligible...Ch. 5 - || A hockey puck leaves a players stick with a...Ch. 5 - || Stopping distance of a car. (a) If the...Ch. 5 - || An 85 N box of oranges is being pushed across a...Ch. 5 - || A stockroom worker pushes a box with mass 11.2...Ch. 5 - || The coefficient of kinetic friction between a...Ch. 5 - || Measuring the coefficients of friction. One...Ch. 5 - | With its wheels locked, a van slides down an...Ch. 5 - | BIO The Trendelberg position. In emergencies...Ch. 5 - || BIO Injuries to the spinal column. In treating...Ch. 5 - || A toboggan approaches a snowy hill moving at...Ch. 5 - || A 25.0 kg box of textbooks rests on a loading...Ch. 5 - || A person pushes on a stationary 125 N box with...Ch. 5 - || You are working for a shipping company. Your...Ch. 5 - || An atmospheric drag force with magnitude FD=...Ch. 5 - || What is the acceleration of a raindrop that has...Ch. 5 - || A bullet is fired horizontally from a...Ch. 5 - | You find that if you hang a 1.2Ekg weight from a...Ch. 5 - | An unstretched 50ring is 12.00 cm long. When...Ch. 5 - BIO Heart repair. A 5urgeon is using material from...Ch. 5 - | A 3 kg mass and a 10 kg mass are attached to...Ch. 5 - || A student measures the force required to...Ch. 5 - | Three identical 6.40 kg masses are hung by three...Ch. 5 - | A light spring having a force constant of 125...Ch. 5 - || in the previous problem, what would the answers...Ch. 5 - || Youve attached a bungee cord to a wagon and are...Ch. 5 - || Atwoods machine. A 15.0 kg load of bricks hangs...Ch. 5 - | Mountaineering. Figure 5.62 shows a technique...Ch. 5 - || Two identical, perfectly smooth 71.2 N bowling...Ch. 5 - || A 2 kg block is launched up a frictionless...Ch. 5 - BIO || The stretchy silk of a certain species of...Ch. 5 - || Block A in Figure 5.66111 weighs 60.0 N. The...Ch. 5 - || Friction in an elevator. You are riding in an...Ch. 5 - BIO || A student attaches a series of weights to a...Ch. 5 - BIO || A 65.0 kg parachutist falling vertically at...Ch. 5 - || Block A in Figure 5.68 weighs 1.20 N and block...Ch. 5 - || A block with mass m1 is placed on an inclined...Ch. 5 - || A pickup truck is carrying a toolbox, but the...Ch. 5 - || A window washer pushes his scrub brush up a...Ch. 5 - || An astronaut on the distant planet Xenon uses...Ch. 5 - || Elevator Design. You are designing an elevator...Ch. 5 - || At night while it is dark, a driver...Ch. 5 - || A block of mass m is placed against the...Ch. 5 - Friction and climbing shoes. Shoes for the sports...Ch. 5 - Friction and climbing shoes. Shoes for the sports...Ch. 5 - Friction and climbing shoes. Shoes for the sports...
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- The drag coefficient C in FD=12CAv2 (Eq. 6.5) depends primarily on the shape of the object. You already have developed an intuition about what shapes correspond to a low C by observing the shapes of aerodynamic cars, boats, and even bullets. Which object, a sphere or a cube, would have a larger drag coefficient, assuming they are nearly the same size? Explain your reasoning. What aspect of an object most determines its drag coefficient?arrow_forwardHelparrow_forwardCalculate the velocity a spherical rain drop would achieve falling (taking downward as positive) from 5.8 km in the following situations. h = 5.8 kml = 4.6 mmd = 1.18 kg/m3 Calculate the velocity in the absence of air drag in m/s.arrow_forward
- 7. The effects of atmospheric drag cannot be deglected, in general, on the dynamics of objects moving through the air. The drag force is found to be FD where p is the density of air, A is the cross sectional area of the object, v is the object's velocity, and Cp is the so called drag coefficient. For a baseball Cp is measured to be - .5ρA Cp υ?, .3. (a) If the baseball is launched vertically with a speed of 90 miles per hour, how high will it travel? How would the answer change ignoring air resistance? (b) What is the speed of the baseball when it comes back down? How would the answer change if there was no air resistance? (c) How long does it take for the baseball to go up? Down? How would the anwers change in the absence of air resistance?arrow_forward|| The 260kg crate shown in the figure rests on a horizontal surface for which the coefficient of kinetic friction is 0.25. If the crate is subjected to a 400 N towing force as shown determine the velocity of the crate in 5 s starting from rest PROBLEM 2 12 P = 400 N 30° The 80 kg block A shown in Figure is released from rest. If the masses of the pulleys and the cord are neglected determine the speed of the 12 kg block B in 3 s. SH Datumarrow_forward3. In Fig. P-537/p. 132, determine the value of P just sufficient to start the 10° wedge under the 400-lb. block. The angle of friction is 20° for all contact surfaces. 400 1 10 Fra. P-537 and P-538. ||arrow_forward
- =. Consider a skydiver falling towards the Earth. Air friction acts to oppose their motion. At some point the skydiver reaches their terminal speed: their constant maximum speed (before they open the parachute). Before and after terminal speed is reached, what can you say about the relationship between the force of air friction and the force of gravity? Briefly explain.arrow_forwardWhat if the "air track" doesn't have an inclination, do you expect the glider to move or not? Explain! В I Fr E EEE C.arrow_forwardA feather, initially at rest, is released in a vacuum 12 m above the surface of the Earth. Which of the following statements is correct? The maximum velocity of the feather is 9.8 m/s O a. The acceleration of the feather remains constant during the fall O b. The acceleration of the feather increases during the fall C. The acceleration of the feather decreases until terminal velocity is reached d.arrow_forward
- Nonearrow_forwardIA 15.0 N bucket is to be raised at a constant speed of 50.0 cm/s by a rope. According to the information in Table 5.1, how many ki- lograms of cement can be put into this bucket without breaking the rope if it is made of (a) thin white string, (b) in. nylon clothesline, (c) 1 in. manila climbing rope?arrow_forwardA fishnet consists of 1 mm diameter strings which form a pattern of 1 cm x 1 cm squares. Estimate the drag to pull a square meter of net at 3 m/s normal to its plane. Treat each string as independent from the others 926 N O 1500 N 300 M 400 Narrow_forward
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