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A 0.75 kilogram ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.5 meter on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 65 N, find what is the maximum speed the ball can have?
A 7.3×10?4V/m electric field creates a 5.0×1017electrons/s current in a 2.0-mm-diameter aluminum wire. What is the mean time between collisions for electrons in this wire
A gasoline engine absorbs 1900 J of heat and performs 530.0 J of mechanical work in each cycle. What is the efficiency of the engine
A hoop and a disk (both of mass 2 kg and radius of 0.3 m) roll without slipping up a straight incline with an initial velocity of 3.2 m/s. What is the maximum gain in height of the disk
A spring-loaded gun shoots a plastic ball with a launch speed of 3.1 m/s. If the spring is compressed twice as far, what will be the ball's launch speed
A 120-V motor has mechanical power output of 2.60 hp. It is 85.0% efficient in converting power that it takes in by electrical transmission into mechanical power. Find the energy delivered to the motor by electrical transmission in 3.20 h of operat..
An artificial earth satellite has a circular orbit of radius 7.10 multiply.gif 106 m in an equatorial plane. Compute the (constant) speed of the satellite
n object is projected from the surface of the earth with a speed of 1.98×104 m/s. What is its speed when it is very far from the earth
A toy car with a mass of 120 g moves to the right with a speed of 0.43 m/s. What is the change in speed of the car
A low-power laser used in a physics lab might have a power of 0.40 mW and a beam diameter of 2.6 mm. Calculate the average light intensity of the laser beam
Suppose the end of your finger is charged. (a) Estimate the breakdown voltage in air for your finger. (b) About what surfacecharge density would have to be on your finger at this voltage?
Estimate the position of C.G or fulcrum & the masses of persons on a 16 feett sea saw, under balanced condition.
A light ray is incident (from air with n = 1) on a material with n = 1.5 as shown in the diagram below. Here ? = 38°. What is the angle of refraction in the material
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