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If a car traveling at 54 km/h will skid 20 m when its brakes lock, how far will it skid if it is traveling at 120 km/h when its brakes lock?
Determine its age assuming that in living trees the ratio of 14C/12C atoms is about 1.2x10-12. Note that the half life of carbon-14 is 5700 years and the Avogadro number is 6.02x1023.
If the translational rms speed of the water vapor molecules (H2O) in air is 534 m/s, what is the translational rms speed of the carbon dioxide molecules (CO2) in the same air? Both gases are at the
The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3. How high does the top of the ice block float above the water level?
Your cup of coffee is too hot to drink when served at 95.0C What is the mass of an ice cube, taken from a -24.0C freezer, that will cool your coffee to a pleasant 56.0C?
A compressed spring shoots the block radically outward along a frictionless groove in the surface of the turntable. What is the turntable's angular speed when the block reaches the outer edge?
Two cars are traveling along a straight road. Car A maintains a constant speed of 78 km/h and car B maintains a constant speed of 103 km/h. At t = 0, car B is 36 km behind car A.
Point C is the center of gravity of the pole. Given d1 = 0.750 m, d2 = 1.50 m, and d3 = 2.25 m, what are the magnitudes of U and D?
How close to the side walk can the flower pot fall before it is too late for a warning shouted from the balcony to reach the man in time?
Find the pressure difference between the inside and outside of the window. (b) If the window is 21 cm by 44 cm, find the force exerted on the window by air pressure.
A capacitor has a capacitance of 2.9 x 10-5 F. In the charging process, electrons are removed from one plate and placed on the other plate. When the potential difference between the plates is 550 V,
A driver in a car traveling at a speed of 68 km/h sees a cat 110 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 107 m? Answer in units of s.
What is the maximum kinetic energy of the photoelectrons when light of wavelength 340 falls on the same surface?Use = 6.63×10-34 for Planck's constant.
A length of copper wire carries a current of 15 A, uniformly distributed through its cross section. Calculate the energy density of the electric field at the surface of the wire.
Three equal point charges, each with charge 1.95 , are placed at the vertices of an equilateral triangle whose sides are of length 0.400 . What is the electric potential energy of the system? (Take
What is the frequency of the ball's motion? What is the value of mass m? What is the total mechanical energy of the oscillator? What is the ball's maximum speed?
An FM radio transmitter has a power output of 187 kilowatts and operates at a frequency of 105.1 megahertzs. How many photons per second does the transmitter emit?
A space exploration team lands on a planet orbiting a star similar to earth's sun. They find that the period of a pendulum of length 1.00 m is 1.70 s. Calculate the acceleration due to gravity on th
How tall is the tower? m (b) If this pendulum is taken to the Moon, where the free-fall acceleration is 1.67 m/s2 what is its period there?
The loaded cab of an elevator has a mass of 3.0 103 kg and moves 243 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?
The beam rests on two knife edges. For what value of x will the beam be balanced at P such that the normal force at O is zero?
If the tape pulled from the dispenser has 0.14 micro C of charge per centimeter, what length of the tape must be pulled to transfer 1.8 x 10^13 electrons to the remaning tape?
The coil is suddenly rotated 90 degrees from an orientation parallel to the field to one perpendicular to the field. (a) If the time to flip the coil 0.50s, what is the average emf produced?
The 14C content of the wood is only 15.0% that of an equal carbon sample from a present-day tree, what is the age of the ancient site?
(a) How long does the projectile remain in the air? (b) At what horizontal distance from the firing point does it strike the ground? (c) What is the magnitude of the vertical component of its veloci