Essential University Physics
4th Edition
ISBN: 9780134988559
Author: Wolfson, Richard
Publisher: Pearson Education,
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Textbook Question
Chapter 4, Problem 7FTD
In paddling a canoe, you push water backward with your paddle. What force actually propels the canoe forward?
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A 1440-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16010 N on the submarine, as well as a downward resistive force of 1170 N. What is the submarine's acceleration?
A 170-kg granite rock (r = 2700 kg/m3) is dropped into a lake. A man dives in and tries to lift the rock. Determine how much force the man needs to apply to lift it from the bottom of the lake. Do you think he can do it?
A student attaches a bucket to a cart resting on a 15° incline. The different force acting on the objects are:
T: Tension of the strings; N: Normal Force; f: any possible friction; W1: weight of cart; and W2: weight of
bucket
cart
T
T
bucket
fk
15° V W1
67. The bucket is filled with water until the cart starts to move up the incline at a constant velocity. Which
one(s) of the following relationships between forces is/are correct?
a. W, >T > f
b. W, >T > f +W, sin 15°
c. W, =T > f
d. W, = T = f +W, sin15°
2
2
2
68. Then, the water is replaced by equal volume of sand. Now, which one(s) is/ are correct?
a. W, >T > f
b. W, >T > ƒ +W, sin15°
c. W, =T > f
d. W, = T = f +W, sin15°
2
2
2
2
Chapter 4 Solutions
Essential University Physics
Ch. 4.2 - A curved barrier lies on a horizontal tabletop, as...Ch. 4.2 - A nonzero net force acts on an object. Which of...Ch. 4.4 - A popular childrens book explains the...Ch. 4.5 - For each of the following situations, would the...Ch. 4.6 - The figure shows two blocks with two forces acting...Ch. 4.6 - (1) Would the answer to (a) in Example 4.5 change...Ch. 4 - Distinguish the Aristotelian and Galilean/New...Ch. 4 - A ball bounces off a wall with the same speed it...Ch. 4 - We often use the term inertia to describe human...Ch. 4 - Does a body necessarily move in the direction of...
Ch. 4 - A truck crashes into a stalled car. A student...Ch. 4 - A barefoot astronaut kicks a ball, hard, across a...Ch. 4 - In paddling a canoe, you push water backward with...Ch. 4 - Is it possible for a nonzero net force to act on...Ch. 4 - As your plane accelerates down the runway, you...Ch. 4 - A driver tells passengers to buckle their...Ch. 4 - Section 4.2 Newtons First and Second Laws A subway...Ch. 4 - Prob. 12ECh. 4 - A small plane accelerates down the runway at 7.2...Ch. 4 - A car leaves the road traveling at 110 km/h and...Ch. 4 - Kinesin is a motor protein responsible for moving...Ch. 4 - Starting from rest and undergoing constant...Ch. 4 - In an egg-dropping contest, a student encases an...Ch. 4 - In a front-end collision, a 1300-kg car with...Ch. 4 - Show that the units of acceleration can be written...Ch. 4 - Your spaceship crashes on one of the Suns planets....Ch. 4 - Your friend can barely lift a 35-kg concrete block...Ch. 4 - A cereal box says net weight 340 grams. Whats the...Ch. 4 - Youre a safely engineer for a bridge spanning the...Ch. 4 - The gravitational acceleration at the...Ch. 4 - A 50-kg parachutist descends at a steady 40 km/h....Ch. 4 - A 930-kg motorboat accelerates away from a dock at...Ch. 4 - An elevator accelerates downward at 2.4 m/s2. What...Ch. 4 - At 560 metric tons, the Airbus A-380 is the worlds...Ch. 4 - Find an expression for the thrust (force) of a...Ch. 4 - You slop into an elevator, and it accelerates to a...Ch. 4 - What upward gravitational force does a 5600-kg...Ch. 4 - Your friends mass is 65 kg. If she jumps off a...Ch. 4 - What force is necessary to stretch a spring 48 cm,...Ch. 4 - A 35-N force is applied to a spring with spring...Ch. 4 - A spring with spring constant k = 340 N/m is used...Ch. 4 - Prob. 36ECh. 4 - Prob. 37ECh. 4 - Prob. 38ECh. 4 - Prob. 39ECh. 4 - Prob. 40ECh. 4 - Prob. 41ECh. 4 - Example 4.3: In the 2015 film The Martian, actor...Ch. 4 - Prob. 43ECh. 4 - A 166-g hockey puck is gliding across the ice at...Ch. 4 - An airplane encounters sudden turbulence, and you...Ch. 4 - A 74-kg tree surgeon rides a cherry picker lift to...Ch. 4 - A dancer executes a vertical jump during which the...Ch. 4 - Find expressions for the force needed to bring an...Ch. 4 - An elevator moves upward at 5.2 m/s. Whats its...Ch. 4 - A 2.50-kg object is moving along the x-axis at...Ch. 4 - Blocks of 1.0, 2.0, and 3.0 kg are lined up on a...Ch. 4 - A child pulls an 11-kg wagon with a horizontal...Ch. 4 - Biophysicists use an arrangement of laser beams...Ch. 4 - A force F is applied to a spring of spring...Ch. 4 - A 22(M)-kg airplane pulls two gliders, the first...Ch. 4 - A biologist is studying the growth of rats on the...Ch. 4 - A small car, with mass 945 kg, is stuck on...Ch. 4 - A 2.0-kg mass and a 3.0-kg mass are on a...Ch. 4 - Youre an automotive engineer designing the crumple...Ch. 4 - Frogs tongues dart out to catch insects, with...Ch. 4 - Two large crates, with masses 640 kg and 490 kg,...Ch. 4 - Your engineering firm is asked to specify the...Ch. 4 - With its fuel tanks half full, an F-35A jet...Ch. 4 - Two springs have the same unstretched length but...Ch. 4 - Although we usually write Newtons second law for...Ch. 4 - A railroad car is being pulled beneath a grain...Ch. 4 - A block 20% more massive than you hangs from a...Ch. 4 - Figure 4.27 shows vertical accelerometer data from...Ch. 4 - A hockey stick is in contact with a 165-g puck for...Ch. 4 - After parachuting through the Martian atmosphere,...Ch. 4 - Your airplane is caught in a brief, violent...Ch. 4 -
A hot-air balloon and its basket are accelerating...Ch. 4 - Two masses are joined by a massless string. A 30-N...Ch. 4 - A mass M hangs from a uniform rope of length L and...Ch. 4 - Jerk is the rate of change of acceleration, and...Ch. 4 - Laptop computers are equipped with accelerometers...Ch. 4 - Laptop computers are equipped with accelerometers...Ch. 4 - Laptop computers are equipped with accelerometers...Ch. 4 - Laptop computers are equipped with accelerometers...
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- A farmer is using a rope and pulley to lift a bucket of water from the bottom of a well that is h, = 9.5 m deep. The farmer uses a force F,= 51 N to pull the bucket of water directly upwards. The total mass of the bucket of water is m; + m, = 3.7 kg. Part (a) Select the correct free body diagram. mg m„gf F mg'm,g m„g m,g F m„gTm,g F m,g F, m„gY m,g m,g Submit Hint Feedback I give up! -Draw your own free body diagram and compare it to the ones listed. |-What forces are acting up, what forces are acting vertically down? Part (b) Calculate how much work Wrin J the farmer does on the bucket of water (via the rope) to raise it to ground level. W,= 484.5 / Correct! Part (c) Calculate how much work W, in J gravity does on the bucket filled with water as the farmer lifts it up the well. W,=- 206.1 W. = -206.1 Part (d) Calculate the net work Wnet in J done on the bucket of water by the two forces F1 and Fg. Wner = 278.37 Wner = 278.4 Feedback: The answer provided was not correct. We have…arrow_forwardMoe, Larry, and Curly push on a 752-kg boat that oats next to a dock. They each exert an 80.5-N force parallel to the dock. (a) What is the acceleration of the boat if they all push in the same direction? Give both direction and magnitude. (b) What are the magnitude and direction of the boat's acceleration if Larry and Curly push in the opposite direction to Moe's push? (c)If Moe, Larry, and Curly all push to the right with 85.0-N forces, and the boat accelerates at 0.530 m=s2 , what is its mass?arrow_forwardA 10000 N (weight) submarine is moving through the water with an applied force of 8000n. A buoyant force of 12000 N and a friction force of 8000N also act in the submarine. What is the sub’s net force what happens to the sub?arrow_forward
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