A57 g plastic ball is moving to the left at 14 m/s. How much work must be done on the ball to cause it to move to the right at 14 m/s? Express your answer using two significant figures. W = ΑΣΦ
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- A saltwater crocodile (Crocodylus porosus) with a mass of 531 kg, is seen chasing prey and reaching a speed of 25.9 km/h in 2.4 s. What is the magnitude of the work (in kJ) done by this crocodile? Enter the numerical part of your answer to three significant figures.A typical human brain has a mass of 1.4 kg, which makes up about 2% of a person's mass. However, the brain requires 20% of the body's power consumption. In essence, the brain requires 10 times as much power as any other organ in the body. The average power output of the human brain is about 2.0 × 10¹ W. Assume that the brain's power output could be converted into mechanical work and calculate how high we could use this power to lift an apple (m = 0.20 kg) in one minute. Number pa UnitsA student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 66 kg, and the height of the water slide is 11.1 m. If the kinetic frictional force does -6.4 × 103 J of work, how fast is the student going at the bottom of the slide? vf = Type your answer here Choose your answer here
- An Olympic weightlifter lifts a 2200 N barbell a distance of 2.2 m. This takes 1.80 s. a. Find the work done by the weightlifter on the barbell in Joules.b. Find the power output of the weightlifter in Watts and in horsepower (hp). Note: 1 hp = 746 WA farmer is using a rope and pulley to lift a bucket of water from the bottom of a well that is hy = 9.5 m deep. The farmer uses a force F1 = 59.5 N to pull the bucket of water directly upwards. The total mass of the bucket of water is mb + mw = 3.1 kg. a.Calculate how much work Wf in J the farmer does on the bucket of water (via the rope) to raise it to ground level. b.Calculate how much work Wg in J gravity does on the bucket filled with water as the farmer lifts it up the well. c. Calculate the net work Wnet in J done on the bucket of water by the two forces F1 and Fg.An object is acted on by the force shown in the figure(Figure 1). What is the final position of the object if its initial position is x = 0.40 mm and the work done on it is equal to 0.21 J? Express your answer using two significant figures.
- Please show me how to work this. Don't round any figures please.Power of the Human Heart. The human heart is a powerful and extremely reliable pump. Each day it takes in and discharges about 7500 L of blood. Assume that the work done by the heart is equal to the work required to lift this amount of blood a height equal to 1.5 m. The density (mass per unit volume) of blood is 1050 kg/m3 . What is the heart's power output. Use g = 9.8m/s2 Calculate answer to one decimal.A 2.00-kg object has a velocity (5.60 î - 1.40 ĵ) m/s. (Note: From the definition of the dot product, v2 = v · v.) (a) What is its kinetic energy at this moment? J(b) Find the net work done on the object if its velocity changes to (8.00 î+ 4.00 ĵ) m/s. J
- A lab cart with a mass of 567 grams has an initial speed of 1.23 meters per second. While the cart rolls through a distance of 35.3 centimeters, a constant force of 4.78 newtons pushes the cart in the direction it's moving. At the same time, friction does -0.237 joules of work. What is the cart's final speed? Include units in your answer.A 51 g particle is moving to the left at 19 m/s . How much net work must be done on the particle to cause it to move to the right at 43 m/s ?The only force acting on a 1.0 kg canister that is moving in an xy plane has a magnitude of 4.1 N. The canister initially has a velocity of 3.9 m/s in the positive x direction, and some time later has a velocity of 7.9 m/s in the positive y direction. How much work is done on the canister by the 4.1 N force during this time?