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A 25 kilogram boy on a playground swing moves with a speed of 4.5 m/s when the 3.0 meter long swing is at its lowest point. The mass of the swing seat is 2.0 kilogram. Neglect the mass of the supporting chains.
Find the angle that the swing makes with the vertical when the boy is at the highest point?
Suppose the boy could pump the swing really fast, compute what speed at the lowest point would be required for the boy to cause the swing to go in a complete circle around its support?
A communications satellite with a mass of 400kg is in a circular orbit about the Earth. Calculate the wieght of the satellite on the surface of the earth
An aluminum baseball bat has a length of 0.695 m at a temperature of 11.0°C. Determine the final temperature of the bat
A 0.150-kg frame, when suspended from a coil spring, stretches the spring 0.070m . A 0.200-kg lump of putty is dropped from rest onto the frame from a height of 30.0cm.Find the maximum distance the frame moves downward from its initial position.
On a summer day, the air conditioning breaks down and the air in your classroom becomes very warm and muggy with a vapour pressure of 20 hPa and a temperature of 25o C.
two points a and b lie 20 cm apart on a line extending radially from a point charge q. if the potential at a is 150 v
the numerical value of the angular velocity of rotation of the earth should be rads in order to make the effective
A person swims east to west across a river that is 30 meters wide.The person swims westward (compared to the water) at constant speedof 3 m/s. The river flows south at a steady speed of 5 m/s. Notethatm even though the person is swimming west comp..
The electric potential at a position located a distance of 21.6 mm from a positive point charge of 8.70×10-9C, estimate the value of the second charge
the space shuttle takes off from cape canaveral in florida and orbits earth 19 times before landing back at cape
an interesting but oversimplified model of an atom pictures an electron in orbit around a proton. suppose this electron
A spacecraft is in orbit around a planet. The radius of the orbit is 3.1 times the radius of the planet (which is R = 71455 km). What is the period of the spacecraft's orbit
You compress a spring with k = 3000 N/m a distance of 0.2 m with a block of mass 4 kg. hat is the velocity of the block after it leaves the spring but before it gets to the incline
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