A mechanical advantage of less than 1.0 is a disadvantage in the common sense of the term. The elevator takes 4.0 s to brake to a stop at the first. The level rises to 40 mL. I = moment of inertia 1. The coefficient of kinetic friction between the grass and the sled is 0.30. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. 4 Kneticiricton betweentne Eras_ Fmnera Sene P = Fd/t What is needed to determine the amount of work done on an object? (a) Construct free-body diagrams for each block. How much force does an 80 kg astronaut exert on Ch. Friction Group Practice Problem: The coefficient of dynamic friction between the grass and a 200 kg football blocking sled is 0.20. The coefficient of static friction between the box and the bed of the truck is 0.800. hb = height to which ball bounces What lever class is most used in the human body? What is happening in this instance? Force exerted on the object Determine the lift force exerted on the plane by, A:Given data: The coefficient of kinetic friction between the grass and the sled is 0.30. Here, m is the mass of the sled and a is the, Q:Problem 4: A crate sits on a rough surface. s = 0.65 m Mass (m) = 1500 kg Draw a free-body diagram of the dress. A 20.O-g ball hangs from the roof of a freight car by a string. For equilibrium, the center of pressure must be directly below the body COM When the bat hits the baseball, two forces act on the ball: To find 18 N B. How much force must he apply to the sled? -e = [(v2post - v1post)/(v2pre - v1pre)], Impact between a moving body and a stationary one 1,5 m. Enter your parent or guardians email address: Whoops, there might be a typo in your email. m = total body mass Draw a free-body diagram on a coordinate plane for this situation. K = 0.30, 2. View this solution and millions of others when you join today! 5 - A fisherman has caught a very large, 5.0 kg fish Ch. What does the scale read now? Full time. Find answers to questions asked by students like you. m = mass Complete the following table Displacement of the object along the line of action of the force during the time the force acts on the object. Candidates will also be on-call at times. From the, Q:The rocket sled shown in Figure 4.5 accelerates at a rate of27.0m/s2. (b) If all other conditions are the same but the ramp has a friction force of 1.9 N, what is the acceleration? How big Ch. Start your trial now! A Mass of 15.0 kg is on an incline with a coefficient of static friction of -offensive lineman will not move unless force is applied 5 - Zach, whose mass is 80 kg, is in an elevator Ch. The scale reads 800 N. (a) What is the person's mass? acceleration due to, Q:There is a 67 kg rubber sled on a wet concrete floor. the South., Q:In t-ball, young players use a bat to hit a stationary ball off a stand. 60 N C. 180 N D. 600 N Solution Verified Create an account to view solutions Recommended textbook solutions The coefficient of static, A:Given: (c) Assume that the upper block does not slip on the lower block, and find the acceleration of each block in terms of m and F. Figure P4.68. 267 N, pushes 60 kg blocking sled across the field at 31. Angle of the incline = 36.87o, Q:Q4: Two boxes with masses m, and m; are placed on a frictionless horizontal surface and pulled A football player at practice pushes a 70 kg blocking sled across the field at a constant speed. The mass of the vertically down at the rate of 30, A:Given data : (Uk ( (kinetic)) is always smaller than Us ( (static)) ) A football player pushes a 670 N blocking sled. High School answered expert verified A football player at practice pushes a 80 kg blocking sled across the field at a constant speed. -kinetic: energy due to motion 5 - a. AGARWAL-PHY-166 5 - Land Rover ads used to claim that their vehicles Ch. answer choices 18 N 60 N 180 N 600 N Question 9 60 seconds F = 20 N 3. 5 - A woman has a mass of 55.0 kg. -The higher the position of the CG, the greater the potentially disruptive torque created if the body undergoes an angular displacement. Taking the drag Ch. A students backpack, full of textbooks, is hung from a spring scale attached to the ceiling of an elevator. The max mechanical advantages for the brachialis, biceps, and brachioradialis occur between angles at the elbow of approximately 75-90 degrees. In most human movement, changes in momentum result from? A 0.60 kg bullfrog is sitting at rest on a Ch. F = force m.a= Fnet A football player at practice pushes a 60 kg blocking sled across the field at a constant speed. 18 N B. Explicitly show how you follow the steps in the Problem-Solving Strategy for Newton's laws of motion. The coefficient of kinetic friction between the grass and the sled is 0.30. vehicle and accelerates at a rate, A:The mass of the trailer ismt=700kg 60 N C. 180 N D. 600 N The moment of inertia (I) represents an objects resistance to angular change about some axis 5 - A 1000 kg car traveling at a speed of 40 m/s skids Ch. Start your trial now! the acceleration of the mug if there, A:Given data: 18 N B. 5 - While standing in a low tunnel, you raise your Ch. Get free access to expert answers Get 3 free question credits W = work done Draw a force diagram for, A:SOlution: (a) What Is the acceleration of the crate? -a mechanical advantage greater than 1.0 allows the force applied (muscle) to be less than the resistive force to produce an equal amount of torque A football player at practice pushes a 60 kg blocking sled across the field at a constant . EDUCATION. A boy pushes the sled and it -the more impulse generated against the floor the higher the jump, collision characterized by the exchange of a large force during a small interval; (total momentum before and after impact are =) Get 5 free video unlocks on our app with code GOMOBILE. Once they stop pushing; how far will the sled slide before coming to rest? Thus, to be in equilibrium, the body COM must be within the boundaries of the base of support. Laluate Given quantities: A. A. 5 - Decide whether each of the following is true or Ch. This problem has been solved! 18 N B. What is her Ch. A football player at practice pushes a 60 kg blocking sled across the field at a constant speed. Ability of a body to return to its original state if its disturbed When she increases the, Q:A 2.0-kg block is on a perfectly smooth ramp that makes an angle of 30 with the horizontal. (b) What is the tension in the rope if he accelerates upward at a rate of 1.50m/s2 ? 5 - Two football players are pushing a 60 kg blocking Ch. coetticient Acceleration of the boat Assume the clothesline is massless. What is a resultant joint torque in the body? -As a muscle's velocity of contraction increases, its maximum force of contraction decreases, capacity to do work What net Ch. r = radius of rotation, -When angular momentum is conserved, changes in body configuration produce a tradeoff between moment of inertia and angular velocity, with a tuck position producing greater angular velocity, Decrease it; the more closely mass is distributed to the axis of rotation, the easier it is to initiate or stop angular motion. F = 400 N, Educator app for Question: 31. (b) What is the net force on the car? Click 'Join' if it's correct. m = 60 kg F = 20 N, 3. Find P for motion to, Q:5 Clear A Mark for Review No human can push on a bat with that much force. She needs to move a heavy crate of bananas ( m = 80 kg) to the, Q:Mr. Vollmayer pulls his children (21kg and 24kg) on a sled (5kg). 5 - Running indoors on a treadmill is slightly easier Ch. Q:(1) A mug rests on an inclined surface, as shown. given that How much force must be produced by the biceps brachii at a perpendicular distance of 3 cm from the axis of rotation at the elbow to support a weight of 200 N at a perpendicular distance of 25 cm from the elbow? (a) What total force resists the motion of the car, boat, and trailer, if the car exerts a 1900-N force on the road and produces an acceleration of 0.550 m/s2? Suppose Kevin, a 60.0-kg gymnast, climbs a rope. 18 N MRT B. k = distance known as the radius of gyration Do wide-track tires = better traction over normal width tires? -Base of Support: This consists of the area enclosed by the outmost edges of the body in contact with the supporting surface of surfaces. DESTION 7 How much force must he apply to the sled? What is, A:Here given the mass 15 kg is on incline with a coefficient of static friction 0.875 . Limbs move in the direction of the applied force - Concentric muscle action (positive work) mass of car M = 1000 kg, Q:While digging a small hole prior to planting a tree, a homeowner encounters rocks. down with a speed of VA= 3 m/s. Experts are tested by Chegg as specialists in their subject area. If the COR between the ball and floor is 0.7, how high will the ball bounce? A crate of weight Fg is pushed by a force P on a horizontal floor as shown in Figure P5.45. Force applied (F) = 4200 N, Q:2) Now, a third block is added between blocks A and B as shown below. The mass of the baseball is 145 g (.145 kg). Acceleration, a = 2.0 m/s2, Q:The contestant now pulls the block of ice with a rope 1. Depends on qualifications and experience. (b) What is the tension in the string? Status. The mass of the pig is 200 kg. third class: lever positioned with the applied force between the fulcrum and the resistance (ex: shovel, bicep curl). International units for power are watts (W) What happens to the volume of the water? (a) What is the tension in the rope if he climbs at a constant speed? Quantity of angular motion possessed by a body measured as the product of moment of inertia and angular velocity (d) If the elevator had no brakes and the cable supporting it were to break loose so that the elevator could fall freely, what would the spring scale read? We have step-by-step solutions for your textbooks written by Bartleby experts! The coefficient of kinetic friction between the grass and the sled is 0.30. The coefficient of kinetic friction between the grass and the sled is 0.30. What is the relationship between the center of pressure and base of support? A We have to, Q:The rocket sled shown in Figure 4.5 accelerates at a rate of 30.0 m/s2. (b) The elevator accelerates upward momentarily at the rate of 2 m/s2. hd = height from which ball is dropped Draw 5 - The forces in Figure P5.11 are acting on a 2.0 kg Ch. A Ch. a., Q:A 12.23 kg box made of rubber is on dry asphalt at rest. 60 N Kf C. 180 N | 60kg D. 600 N Disti Show transcribed image text Expert Answer Dear (b) What is the size of the force acting on it? along flat, snow-covered ground. Mathematical Methods in the Physical Sciences, David Halliday, Jearl Walker, Robert Resnick, Alan Giambattista, Betty Richardson, Robert Richardson. The coefficient of static friction is s, and P is directed at angle below the horizontal. William Moebs, Samuel J. Ling, Jeff Sanny. Note: Normally, your blood vessels constrict and expand to keep your brain blood pressure stable when you change your posture. Four blocks EACH of mass m = 10 kg are arranged as shown, A:massofeachblock(m)=10kgF1h=90N(toright), Q:Problem# 4: A trailer with a mass of 700 kg is pulled by a 2000-kg EX: while standing or sitting on a swiveling chair (rotate your upper body in 1 direction -> chair + lower body rotate in the opposite direction) (b) Find the maximum acceleration the truck can have before the box slides. 5 - Raindrops can fall at different speeds; some fall Ch. When the elevator is accelerating downward at 3.8m/s2 , the scale reads 60 N. (a) What Is the mass of the backpack? A motorcycle and rider have a total mass equal to 300 kg. Question 4 Units = kg m2/s No movement - Isometric muscle action (no mechanical work), -rate of doing work first class: lever positioned with the applied force and the resistance on opposite sides of the axis of rotation (ex: seesaw; scissors) Get access to millions of step-by-step textbook and homework solutions, Send experts your homework questions or start a chat with a tutor, Check for plagiarism and create citations in seconds, Get instant explanations to difficult math equations. Suppose a 60.0-kg gymnast climbs a rope. The mass of the boat plus trailer is 700 kg. A car with a mass of 1000.0 kg accelerates from 0 to 90.0 km/h in 10.0 s. (a) What is its acceleration? 5 - A ball is thrown straight up. This diagram indicates all types of, Q:6. 5 - Two workers are sliding a 300 kg crate across the Ch. -MOI (I) reduces when the diver goes from a layout to a tuck and then increases as the diver opens up to enter into the water. (I)1 = (I)2, When angular momentum is conserved, there is a tradeoff between MOI and angular velocity..discuss this, Fully tucked position: low MOI, high angular velocity -potential: energy due to position (b) What is the force in the hitch between the car and the trailer if 80% of the resisting forces are experienced by the boat and trailer? Calculate the force required to push the sled across the field. 5 - Is it possible for an object to travel in air Ch. 5 - A person with compromised pinch strength in his Ch. Its engines produce 1.250107 N of thrust, and air resistance is 4.50106 N. What is the rocket's acceleration? a. A:Mass of person = m = 58 kg A 500 N BALIKBAYAN BOX WAS UNLOADED BY A DELIVERY TRUCK IN A DRIVEWAY. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Balanced OR Unbalanced 60 N C. 180 N D. 600 N the point around which the mass and weight of a body are balanced in all directions OR The point about which the sum of torques produced by the weights of the body segments is equal to zero. Mass of the mug,m=0.27kg Watch these videos for an in-depth look. (increases in impact velocity and temp increase COR). [units: kg m2] Pushing Blocks How does power relate to force and velocity? 5 - An astronauts weight on earth is 800 N. What is Ch. of mass m. The, Q:atus: When you push a box along the hoor with a force of 7 N. the bo moves at, Q:Freaks yon. Consider two blocks, A and B, where m, < mp. A 5.00105 -kg rocket is accelerating straight up. The coefficient of the static friction is 0.3. You can specify conditions of storing and accessing cookies in your browser, A football player at practice pushes a 80 kg blocking sled across the field at a constant speed. 5 - What is the drag force on a 1.6-m-wide, 1.4-m-high Ch. Q:C8. 5 - A 2.0 kg ball is suspended by two light strings as Ch. KE = kinetic energy Multiply F by the coefficient of kinetic friction between the player and the sled to get the force required to push the sled across the field. 5 - It is friction that provides the force for a car Ch. Compare the force block A, A:Given: 2. type of molecular interaction between the surfaces. How much force must he apply to the sled 1 See answer Advertisement okpalawalter8 Answer: The value is Explanation: A football player at practice pushes a 60 kg blocking sled across the field at a constant speed. If the vehicle is accelerating at, A:Write down the given values using suitable variables. F=mf F= (65) (3) F= 195 A 590-kg rocket is at rest on the launch pad. *Response times may vary by subject and question complexity. (b) As a baseball is being caught, its speed goes from 30 to 0 m/s in about 0.005 s. Its mass is 0.145 kg. 5 - Blocks with masses of 1.0 kg, 2.0 kg, and 3.0 kg Ch. If the Ch. When a 1.50-kg dress hangs midway from a taut clothesline stretched between two poles planted 7.50 m apart, the clothesline is seen to sag 0.0500 m. a. A small rock (m-3 kg) and a car (m-1000 kg) stay still on flat ground. 5 - A 75 kg passenger is seated in a cage in the Sling Ch. B9., Q:Q1: Calculate the force necessary 5 - Eric has a mass of 60 kg. 5 - Researchers often use force plates to measure the Ch. Determine the coefficient of kinetic friction between the player and the sled. What is torque and how do we calculate it? angle of inclination of ramp, = 20o a. F = average force applied to an object 5 - A 20,000 kg rocket has a rocket motor that Ch. A 50 kg box hangs from a rope. Responsibilities will include enforcing both state and local animal laws, educating the community about these laws, and rescuing animals. (a) What is Two football players are pushing 60 kg blocking sled across the field at a constant speed of 2.0 m/s. What is the tension produced on the clothesline by the dress? 5 - A football player at practice pushes a 60 kg Ch. How much force musthe apply to the sled? A marble is placed in a graduated cylinder, which was filled to the 20 mL mark. The, Q:Notes The box is not moving. What must aybe, Q:1. a) A boat moves through the water with two forces acting on it. what are common external forces of momentum? 5 - The two blocks in Figure Q5.28 are at rest on Ch. (a) What Is the tension in the rope if he climbs at a constant speed? 200 kg football blocking sled is 0.20. Feedback Show that the mass will slide down the plane if s tan , where s is the coefficient of static friction between the block and the plane. A man exerts a horizontal force of 125 N on a crate with a mass of 30.0 kg. The mass of the vehicle isMv=2000kg a) What is the net, Q:A boy pulls a carriage with a force of 20N by a thick rope making an angle of 25 with the, A:Neglect friction since the coefficient of friction isn't given (b) What is the minimum possible value of the coefficient of static friction between the crate and the floor? This, Q:A boat moves through the water with two horizontal forces acting on it. The wheels of a midsize car exert a force of 2100 N backward on the road to accelerate the car in the forward direction. (a) What total force resists the motion of the car, boat, and trailer, if the car exerts a 1900-N force on the road and produces an acceleration of 0.550 m/s2? -Angular velocity () increases when the MOI decreases and it decreases as the diver increases MOI. the acceleration. 5 - Section 5.2 Dynamics and Newtons Second Law 9. m = mass of block. The rider applies the brakes, causing the motorcycle to accelerate at a rate of 5 m/s2.