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A small rock with mass .12kg is fastened to a massless string withlength 0.80 m to form a pendulum. The pendulum is swinging so as tomake a maximum angle of 45* with vertical. Air resistance is negligible.
a) What is the speed of the rock when the string passes through the vertical position?b) What is the tension in the string when it makes an angle of 45*with a vertical?c) What is the tension in the string as it passes through thevertical?
You decrease the angular speed of the cylinder from 4:0 rad/s to 2:0 rad/s in 20:0 revoluations at constant angular acceleration. What is the angular acceleration during this decrease
A cannon tilted up at a 26 degree angle fires a cannon ball at 71m/s from atop a 12m -high fortress wall
A resistor is constructed by forming a material of resistivity 3.5x10^5 into the shape of a hollow cylinder of length 4.0 cm and inner and outer radii of 0.50cm and 1.2cm, respectively. Find the resistance of the cylinder
A plastic sheet of thickness 250 nm appears to be green in the figure below (?green=500nm), What is the plastic's index of refraction
Four particles, one at each of the four corners of a square with 3m-long edges, are connected by massless rods. The masses of the particles are m1 = m3 = 4kg and m2 = m4 = 5kg. Determine the moment of inertia of the system about the z axis.
A pitcher throws a 0.140-kg baseball, and it approaches the bat at a speed of 50m/s. The bat does Wnc = 70J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 25.0 m abo..
A transformer with a turns ratio (secondary:primary) of 1:80 is used to step down the voltage from a 120-V wall socket to be used in a battery recharging unit. What is the voltage supplied to the recharger?
A cylinder is rolling along the ground without the slipping at 7m/s. It comes to a hill and begins going up. Assuming no losses to friction, how high vertically would it go before it stops.
A gymnast of mass 69.0 kg hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value 9.81 for the acceleration of gravity.
The primary coil of a transformer has 3,802 loops. The secondary coil has 602,030 loops. The primary coil has a 97 A current and 2 V. ) Determine the power of the primary coil......W. Assuming no losses, determine the power of the secondary coil......
two dry-ice pucks covered with plasticine are on a collisioncourse; one of the mass 467g travles south at a speed of 2.6m/s. calculate their speedand direction of travle
The intersection is 15 m wide. Her car's maximum deceleration is -5.20 m/s2, whereas it can accelerate from 44km/h to 70km/h in 7.8 s. overlook lengths of her car and her reaction time.
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