Physics Force & Laws Of Motion Level: Misc Level
A 75- kg passenger riding in an automobile is involved in a 20.0 m /s head -on collision with a concrete barrier. The stopping time is 100 milliseconds. What is the force exerted by the seat belt and shoulder strap on the passenger?
Physics Force & Laws Of Motion Level: Misc Level
Two wads of putty are propelled directly toward each other in the horizontal plane.Wad -1 has a mass of 5.00 kg and is traveling at 21.0 m /s south. Wad -2, which is 6.00 kg, is moving at 12.0 m /s north. They collide and stick together. What is the velocity of the joint mass of putty?
Physics Force & Laws Of Motion Level: Misc Level
While floating in space a 100- kg robot throws a 0.800 kg wrench at 12.0 m /s toward his /her partner working on the spaceship. How fast will the robot move away from the ship?
Physics Gravitation Level: Misc Level
It is possible for a large star to gravitationally collapse, crushing itself into a tiny neutron star perhaps 40 km in diameter.Suppose such a thing could happen to our Sun, which is 1.39 x 10 ^9 meters in diameter and spinning at a rate of one revolution every 27 days. What would the spin rate be for the neutron star?You may assume that the moment of inertia of the Sun is 1 /2 m r ^2.
Physics Rotational Mechanics Level: Misc Level
An 10,000 N automobile is stalled 1 /3 of the way across a 10 k m bridge. What are the opposition forces at both ends of the bridge resulting from the stalled auto?
Physics Rotational Mechanics Level: Misc Level
When hit with a driver a slightly sloped head, a golf ball sails off rotating at 75 rev /sec. if the ball has a diameter of 4 cm, how fast is a point on the surface moving just as a result of spin?
Mathematics Algebra Level: Misc Level
Solve the inequality. 33 < 4 x + 9 < 41
Mathematics Algebra Level: Misc Level
Solve the inequality. 4 ( x -7) < or =to 12
Mathematics Algebra Level: Misc Level
Solve the inequality. 9 x - 11 > or =to 4 x + 34
Physics Current Electricity Level: Misc Level
An L R C circuit has L = 27.1 m H and R =8.50?.
a. What value must C have to produce resonnance at 4.00 E3 Hz?
b. What will be the maximum current at resonance if the peak external voltage is 1.8 E 2 V?
Physics Current Electricity Level: Misc Level
What is the resistance of a coil if its impedance is 335 ? and its reactance is 145 ??
Physics Current Electricity Level: Misc Level
A 2.5- k ? resistor and a 2.7- ? F capacitor are connected in series to an ac source.
a. Calculate the impedance of the circuit if the source frequency is 6.0 E 1 Hz
b.Calculate the impedance of the circuit if the source frequency is 6.0 E 4 H z..
Physics Current Electricity Level: Misc Level
A 1.20 E 2- m H radio coil is connected to a 2.40 E 2- V ( r m s ) 12.0- k H z ac line. Ignore resistance.
a. Calculate the reactance of the radio coil.
b.Calculate the rms current in the radio coil.
Physics Current Electricity Level: Misc Level
At what frequency will a 13.0 mH inductor have a reactance of 6.5 E 2 ?
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
The magnetic field inside an air - filled solenoid 39 cm long and 1.0 cm in diameter is 0.40 T. Approximately how much energy is stored in this field?
