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You're burning calories by weight lifting. You lift a 65kg barbell 1.7m, and repeat 10 times.
A. How much energy in do you expend?
B. How much energy in CaI do you expend?
In the overhead view of Fig. 9-54, a 300 g ball with a speed v of 6.0 m/s strikes a wall at an angle ? of 30°, determine the impulse on the ball from the wall
A 4.38-kN piano is lifted by three workers at a constant speed to an apartment 27.2 m above the street using a pulley system fastened to the roof of the building. find the time required to lift the piano from the street to the apartment
A uniform stick d = 1 m long with a total mass of 249 g is suspended vertically from a frictionless pivot at its top end. A wad of putty of mass 26 g is moving horizontally with speed v. It strikes and sticks to the stick at a distance 0.75 m from..
A 645N woman climbs a staircase that rises at 50 degrees above the horizontal and is 4.95m long. Her speed is a constant 40.0cm/s. How much work has gravity done on her as she climbed the stairs
A chair of weight 85.0N lies atop a horizontal floor; the floor is not frictionless. Using Newton's laws, calculate n, the magnitude of the normal force that the floor exerts on the chair
A liquid with a specific gravity of 0.72 is flowing at 5.5 ft/sec through a 6 inch diameter pipe (ID=6.065 inches). What is the volumetric flow rate
An automobile engine takes in 4000 J of heat and performs 1100 J of mechanical work in each cycle. How much heat is "wasted" in each cycle
Suppose that you pull on the rope OA shown in the figure, exerting a 50 N force F at O. What are the force vectors
a 1cm high object is placed 20cm to the left of a converging lens f(focal length)=10cm. where is the final image and how high is it
A spring-loaded pellet gun is designed to fire 3.50 g projectiles horizontally at a speed of 39.1 m/s. What maximum force is required to load the gun
Ekapluto is an unknown planet that has two moons in circular orbits. Moon A: Mass = 4x10^20 kg Orbital radius = 2x10*8 m orbital period = 4x10^6 s, find the maximum gravitational force between the two moons
The relationship between angular frequency and wavenumber for a deep water wave is: ?=gk????, what is the group velocity of the wave
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