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A constant 80-N force acts on a 5.0 kg box. The box initially is moving at 20 m/s in the direction of the force, and 3.0 s later the box is moving at 68 m/s. Determine both the work done by this force and the average power delivered b the force during the 3.0-s interval.
If a car travelling at 52 km/h will skid 18 m when its brakes lock, how far-off will it skid if it is travelling at 120 km/h when its brakes lock.
The force given by the wind pushes the ship towards North by a velocity of 40 kmph. The ocean current on the other hand, determine the ship's actual velocity
A 1.0-cm-diameter microscope objective has a focal length of 2.8 mm . It is used in visible light with a wavelength of 550 nm. What is the objective's resolving power if used in air
John measured the thickness of a book using a ruler. Calculate the mean thickness of the book.
In the Millikan oil-drop experiment illustrated in the figure below, an atomizer is used to introduce many tiny droplets of oil between two oppositely charged parallel metal plates, Estimate the radius of an oil drop of density 854 kg/m3 for which it..
The upward velocity of the 5 kg block is v1 = 3 m/s when it is at a height ht = 10 m from the sandy surface. Determine time to stop the motion of the block if the average impulsive force acting on the block
Calculate, using Newton's law of gravity, the magnitude of the force of attraction between the Earth and a mass of 16.000 kg on the Earth's surface
How much does it cost to cook food in a 12,000 W oven for 47.6 minutes? Assume electricity costs 8.0 cents per kW·h
If the coefficient of friction between the ladder and ground is 0.42, illustrate what is the mass of the heaviest person who can safely ascend to the top of the ladder?
A charged particle m=6g q=-80 c moves in a region of uniform field along a helical path (radius = 3.0 cm, pitch = 9.0 cm) as shown. Illustrate what is the angle among the velocity of the particle and the magnetic field?
An electron and a positron, each moving at 3.0*10^5 m/s, collide head on, disappear, Determine the momentum of each photon
A transformer on a pole near a factory steps the voltage down from 3600 V (rms) to 120 V (rms). The transformer is to deliver 2000 kW to the factory at 95% efficiency. Find values for the the power delivered to the primary
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