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A small block on a frictionless horizontal surface has a mass of 2.25×10?2kg . It is attached to a massless cord passing through a hole in the surface. (See the figure below (Figure 1) .) The block is originally revolving at a distance of 0.255m from the hole with an angular speed of 1.90rad/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.185m. You may treat the block as a particle. What is the new angular speed? Find the change in kinetic energy of the block. How much work was done in pulling the cord?
A capacitor with its plates separated by paper stores 4.8 of charge when it is connected to a particular battery. An otherwise identical capacitor, How much charge does that capacitor store
A rugby player passes the all 7.00m across the field, where it is caught at the same height as it left his hand. How long did this pass take
q1. a cannonball shot with the initial velocity of 129 ms at an angle of 36deg follows a parabolic path and hits a
A 0.250 mm thick strip of calcium metal is placed in a perpendicular magnetic field of 5.00T. how many free electrons per calcium atom are there
In the figure, block 1 of mass m1 slides from rest along a frictionless ramp from height h = 2.1 m and then collides with stationary block 2, which has mass m2 = 5m1. After the collision, block 2 slides into a region where the coefficient of kinetic ..
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.70 104 m/s, and the radius of the orbit is5.00 106 m. What is the orbital speed of the second satellite
What is the electric field vec E. What is force vec F on a -1.0 nC charge placed at the midpoint.
A 2.40 kg ball is attached to an unknown spring and allowed to oscillate. When does the maximum of acceleration occur
To test the quality of a tennis ball, you drop it onto the floor from a height of 4.02 m. what is its average acceleration during that contact
A major motor company displays a die-cast model of its first automobile, made from 6.60 kg of iron. What mass of gold is needed to make the new model
When 3880 J of heat are added to a 0.159-m-long silver bar, its length increases by 4.31 x 10-3 m. What is the mass of the bar
80 pF capacitor and a 320 pF capacitor are both charged to 2.8 kV. They are then disconnected from the voltage source and are connected together, Find the resulting potential difference across each capacitor
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