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A 0.50 kg ball that is tied to the end of a 1.2 m light cord is revolved in a horizontal plane by the cord making a 30° angle, with the vertical.
a) Decide the ball's speed.
b) If, instead, the ball is revolved so that its speed is 4.0 m/s, what angle does the cord make with the vertical?
c) If the cord can withstand a maximum tension of 9.3 N, what is the highest speed at which the ball can move?
An elastic cord is 66 cm long when a weight of 66 N hangs from it but is 86 cm long when a weight of 76 N hangs from it. What is the "spring" constant k of the elastic cord.
21.18 g of copper pellets are removed from a 286°C oven and immediately dropped into 198.5 mL of water at 13°C in an insulated cup
You are designing an elevator for a hospital. The force exerted on a passenger by the floor of the elevator is not to exceed 1.51 times the passenger's weight. What is the maximum speed of the elevator
A force given by F(x) = 5x3 (in N/m3) acts on a 1-kg mass moving on a frictionless surface. The mass moves from x = 3.87 m to x = 6.09 m. How much work is done by the force
A ball on the end of a string is whirled around in a horizontal circle of radius 0.300 m. The plane of the circle is 1.10 m above the ground. Find the radial acceleration of the ball during its circular motion
A plane is sitting on a runway, awaiting takeoff. On an adjacent parallel runway, another plane lands and passes the stationary plane at a speed of 45m/s. For how long a time is the moving plane visible
The morning sounding shows an is othermal layer from 800 to 700 mbat -11oC, and the temperature in the layer from 390 to250 mb decreases steadily from -47 to -55oC. What is the thickness of these layers?
When a guitar string is sounded along with a 440 Hz tuning fork, a beat frequency of 4 Hz is heard. compute the frequency of the string
An object is initially placed on the optical axis 27.1 cm to the left of a convex lens that has a focal length of 14.7 cm. The image is real and inverted. what is the new image distance
A sample of an ideal gas is at a temperature of 307 K. The rms molecular speed at this temperature is measured as 2767 m/s. Calculate the average molecular kinetic energy of this sample
You are driving just behind a second car and both of you are moving at a speed 68. If you are very tired after a long night, or you are texting, or you are alcohol impaired, your reaction time can be twice your standard reaction time. What is the m..
A 39.0-kg child swings in a swing supported by two chains, each 3.10 m long, Find the force exerted by the seat on the child at the lowest point
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