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A copper wire has a square cross section 2.7 on a side. The wire is 3.8 long and carries a current of 4.0 . The density of free electrons is 8.5*10^28 m^-3. Find the magnitude of the electric field
A scaffold of mass 49 kg and length 5.8 m is supported in a horizontal position by one vertical cable at each end. A window washer of mass 77 kg stands at a point 1.0 m from one end. What is the ten
At t=0 a grinding wheel has an angular velocity of 20.0 rad/s. It has a constant angular acceleration of 29.0 rad/s^2 until a circuit breaker trips at time t = 2.20 s. From then on, it turns throug
You hold a meterstick horizontally with the same mass suspended at the end. Rank the torque needed to keep the stick steady; from largest to smallest.
At the top of its trajectory, the projectile explodes into two fragments of masses 0.72 kg and 1.28 kg. At 3.8 s after the explosion, the 1.28-kg fragment lands on the ground directly below the poi
The volume of an ideal gas is increased from 1 m3 to 8 m3 while maintaining a constant pressure of 1000 Pa (1 Pa = 1 N/m2). How much work is done by the gas in this expansion?
The coefficient of kinetic friction between the tires and the road is 0.720. What is the speed of the automobile after 1.30 s have elapsed?
A luge and its rider, with a total mass of 82 kg, emerge from a downhill track onto a horizontal straight track with an initial speed of 43 m/s. Assume that they stop with a constant deceleration of
A ceiling fan with 82-cm-diameter blades is turning at 62 rpm. What is the speed of the trip of a blade 10 s after the fan is turned off?
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?