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1) A student pushes on a swinging door to leave a class. How much torque is exerted in each of the following cases if the force exerted is 50 N?
A - The student pushes perpendicular to the door at the end farthest from the hinges (a distance of 80 cm).
B - The student pushes at an angle of 60 degrees to the door at the end farthest from the hinges.
C - The student pushes perpendicular to the door at the end where hinges are located.
2) How much tension does your bicep exert in order to support your forearm held out horizontally if the weight of your forearm is 12N? Assume the centre of mass of your lower arm is located 15 cm from the elbow joint and the bicep is located 5 cm from the elbow joint.
3) How much tension does your bicep exert to support not only your arm, but also a 12N weight in your hand? Assume the weight is located 20 cm from the centre of mass of the lower arm.
Two air track carts are sliding to the right at 2 m/s. The springbetween them has a constant of 150 N/m and is compressed 4 cm. Thetwo carts slide past a flame that burns the string holding themtogether. What are the speed and direction of each ca..
What is the density of Kripton gas at standard temperature and pressure? The atomic mass of Kripton is 83.80 atomic mass unit
Consider a large number of simple pendulums each of length b and massm, which possess energies lying between E1 and E2. Show that the Hamiltonian for each pendulum is an ellipse.
Quarks carry spin 1/2. Three quarks bind together to make a baryon (such as the proton or neutron); two quarks (or more precisely a quark and an anti-quark) bind together to make a meson (for example the pion or the kaon). Suppose the quarks are i..
Figure (a) shows a sphere of radius r = 21 cm and density of ρ = 3.1 g/cm3 suspended in water. What is tension in the string
Young David who slew Goliath experimented with slings before tackling the giant. He found that he could revolve a sling of length 0.650 m at the rate of 9.00 rev/s. What is the speed of the stone for each rate of rotation
a balloon that has fb 12n takes up a volume of 3.3l. what must the density of the air be for the ballon to float? what
A skier travels down the trail. The slope is inclined at an angle of 22 degree and the coefficient of kinetic friction for the skier's shoes-ice surface is 0.2. Compute what the skier acceleration down the hill
A 2.00-kg mass object traveling east at 20.0 m/s collides with a 3.00-kg mass object traveling west at 10.0 m/s. After the collision, the 2.00-kg mass has a velocity 5.00 m/s to the west. how much kinetic energy was lost during the collision ?
Jane, looking for Tarzan, is running at topspeed (6.7 m/s) and grabs a vine hanging vertically from a talltree in the jungle. How high can she swing upward
Suppose you want to observe neutron diffraction in a crystal with 0.24nm spacing between lattice planes. Find the momentum of neutrons having wavelength equal to this spacing
When a 29.0-V emf device is placed across two resistors in series, a current of 10.0 A is flowing in each of the resistors. compute the magnitude of the larger of the two resistances
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