The world's fastest humans can reach speeds of about 11 m/s
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A 70 kg person can achieve the maximum speed of 2.5 m/s while running a 100...
A 70 kg person can achieve the maximum speed of 2.5 m/s while running a 100 m dash. Treat the person as a point particle. a. At this speed, what is the person's kinetic energy? Express your answer with the appropriate units. b. To what height above the ground would the person have to climb in a tree to increase his gravitational potential energy by an amount equal to the kinetic energy you calculated in part A? Express your answer...
A world-class sprinter can reach a top speed (of about 11.6 m/s ) in the first...
A world-class sprinter can reach a top speed (of about 11.6 m/s ) in the first 19.0 m of a race. What is the average acceleration of this sprinter? How long does it take her to reach that speed?
A world-class sprinter can reach the top speed of about 11.1 m/s in the first 17.0...
A world-class sprinter can reach the top speed of about 11.1 m/s in the first 17.0 M of a race. What is the average acceleration of the sprinter? how long does it take her to reach that speed?
A world-class sprinter can reach a top speed (of about 11.9 m/s ) in the first...
A world-class sprinter can reach a top speed (of about 11.9 m/s ) in the first 20.0 m of a race. What is the average acceleration of this sprinter? Express your answer with the appropriate units. How long does it take her to reach that speed? Express your answer with the appropriate units.
Professional baseball pitchers can deliver a pitch which can reach the blazing speed of 100 mph...
Professional baseball pitchers can deliver a pitch which can reach the blazing speed of 100 mph (miles per hour). A local team has reach drafted an up-and-coming left handed pitcher who can consistently throw at 90.00 mph. Assuming the ball has a mass 142.8 g and has this speed just before a batter would make contact, how much kinetic energy does the ball have? How high would the ball need to be dropped from to attain the same energy (neglect...
A piece of chocolate cake contains about 400 Calories. A nutritional Calorie is equal to 1000...
A piece of chocolate cake contains about 400 Calories. A nutritional Calorie is equal to 1000 calories (thermochemical calories). How many 6-in-high steps must a 110-Ib man climb to expend the 400 Cal from the piece of cake? (Potential energy is given by PE = mgz, where m is the mass in kilograms, g is the gravitational constant (9.81 m/s2), and z is the distance in meters.) steps Need Help? Read It Watch It Supporting Materials Periodic Table 3 Constants...
In order to increase the amount of exercise in her daily routine, Tara decides to walk...
In order to increase the amount of exercise in her daily routine, Tara decides to walk up the five flights of stairs to her car instead of taking the elevator. Each of the steps she takes are 18.0 cm high, and there are 12 steps per flight. (a) If Tara has a mass of 55.0 kg, what is the change in the gravitational potential energy of the Tara-Earth system (in J) when she reaches her car? J (b) If the...
1. A Constant force pushes an object and speeds it up. The object moves from (6i - 8j + 4k)m to (...
1. A Constant force pushes an object and speeds it up. The object moves from (6i - 8j + 4k)m to (11i - 5j + 4k)m. The net force acting on the object is (2i + 4j + 5k)N. What is the increase in it's kinetic energy, in J? So I found in the x direction to be 10 J and in the y direction to be 12 J. I ignored the work in the k direction as the object...
True-False (2 points each). Circle the correct answer. 1) D F An isolated system has a...
True-False (2 points each). Circle the correct answer. 1) D F An isolated system has a net external force of zero. 2)TF Momentum is conserved in an isolated system. 3) TT The definition of work is W = Fdcos(0) 4) T (F) The spring force is proportional to the displacement of the spring end. 5) O T Engines and generators can be 100% efficient. 6) DF The impulse is equal to the change in momentum. 7) DF In an isolated...
Because it can go from rest to 7.4 m/s (about 17 mi/h) in 1.1 s, one...
Because it can go from rest to 7.4 m/s (about 17 mi/h) in 1.1 s, one of the fastest-accelerating animals is the cheetah. If its mass is 56.0 kg, determine the average power developed by the cheetah during the acceleration phase of its motion. Express your answer in the following units. (a) watts Can you write an expression for the average power of the cheetah in terms of the work done by the cheetah and the time over which this...
Professional baseball pitchers can deliver a pitch which can reach the blazing speed of 100 mph (miles per hour). A local team has reach drafted an up-and-coming left handed pitcher who can consistently throw at 90.00 mph. Assuming the ball has a mass 142.8 g and has this speed just before a batter would make contact, how much kinetic energy does the ball have? How high would the ball need to be dropped from to attain the same energy (neglect...
A piece of chocolate cake contains about 400 Calories. A nutritional Calorie is equal to 1000 calories (thermochemical calories). How many 6-in-high steps must a 110-Ib man climb to expend the 400 Cal from the piece of cake? (Potential energy is given by PE = mgz, where m is the mass in kilograms, g is the gravitational constant (9.81 m/s2), and z is the distance in meters.) steps Need Help? Read It Watch It Supporting Materials Periodic Table 3 Constants...
True-False (2 points each). Circle the correct answer. 1) D F An isolated system has a net external force of zero. 2)TF Momentum is conserved in an isolated system. 3) TT The definition of work is W = Fdcos(0) 4) T (F) The spring force is proportional to the displacement of the spring end. 5) O T Engines and generators can be 100% efficient. 6) DF The impulse is equal to the change in momentum. 7) DF In an isolated...
Because it can go from rest to 7.4 m/s (about 17 mi/h) in 1.1 s, one of the fastest-accelerating animals is the cheetah. If its mass is 56.0 kg, determine the average power developed by the cheetah during the acceleration phase of its motion. Express your answer in the following units. (a) watts Can you write an expression for the average power of the cheetah in terms of the work done by the cheetah and the time over which this...
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