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A charge of 28.0 {rm nC} is placed in a uniform electric field that is directed vertically upward and that has a magnitude of 4.00×104 N/C. What work is done by the electric force when the cha
A 0.230- coffee cup at 19 is filled with 0.240 of brewed coffee at 97. The cup and the coffee come to thermal equilibrium at 79.If no heat is lost to the environment, what is the specific heat of t
Same geometry as above but now the magnetic field decreases uniformly from 250 mT to zero in 0.5 s. Find the induced emf and the polarity of the induced current.
The two people, who have been sitting at opposite ends of the boat, 2.5 {rm m} apart from each other, now exchange seats. How far will the boat move? In what direction will the boat move?
A circular loop of radius 10 cm lies in the plane of the paper. A constant magnetic field of 250 mT is directed into the paper. Find the magnetic flux through the loop. (b) Same geometry as above bu
A 62 kg skier is going down a slope oriented 34° above the horizontal. The area of each ski in contact with the snow is 0.13 m2. Determine the pressure that each ski exerts on the snow.
Suppose now a 2000-W laser beam is concentrated by a lens into a cross-sectional area of 10^-6 cm^2. Find the corresponding irradiance and amplitude of the E-field and B-field.
A 60 kg figure skater with her arms outstretched spins on one skate at one revolution per second. By treating her body as a vertical cylinder, and each arm as a thin rod stuck out from the centre o
Determine the peak wavelength of the blackbody radiation emitted by the average person. In what region of the electromagnetic spectrum is this wavelength found?
Two identical piano wires have a fundamental frequency of 485 Hz when kept under the same tension. What fractional increase in the tension of one wire will lead to the occurrence of 4 beats/s when
Batteries are rated in terms of ampere-hours (A h). For example, a battery that can produce a current of 3.00 A for 5.00 h is rated at 15.00 A h. (a) What is the total energy stored in a 9.0-V batte
A 280 g glider is pushed toward it from the far end of the track at a speed of 120 cm/s. It collides with and sticks to the 410 g glider. What are the amplitude and period of the subsequent oscillat
To support the uniform boom a cable runs from this same point to a wall (the left hand vertical coordinate) and by a pivot on the same wall at an elevation of 3m. (max is 8.5m, so left side of trian
Starting from rest, the disk is released from the top of the steel plate. How long does it take for the disk to reach the bottom, and what is it's final velocity?
A block of ice at 0 degrees C, whose mass is initially 30.0 kg, slides along a horizontal surface, starting at a speed of 5.66 m/s and finally coming to rest after traveling 21.8 m. Compute the mas
A truck travels beneath an airplane that is moving 150 km/h at an angle of 55? to the ground. How fast must the truck travel to stay beneath the airplane?
Two people with a combined mass of 120 kg hop into an old car with worn-out shock absorbers. This causes the springs to compress by 8.30 cm. When the car hits a bump in the road, it oscillates up an
Give your answer as a distance. Find the direction of the displacement that will return Bob to his starting point by the most direct route.
What mass (in grams) of steam at 100°C must be mixed with 277 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 28.0°C?
Calculate its angular acceleration, assumed constant. Calculate the total number of revolutions the engine makes in this time.
A 10.4 kg runaway grocery cart runs into a spring with spring constant 250 N/m and compresses it by 68 cm. What was the speed of the cart just before it hit the spring?
It carries total charge -Q. What is the electric field vector at any point on the surface of a sphere centered at the origin with radius two meters
Sticks to the very bottom tip of the rod. To what maximum angle, measured from vertical, does the rod (with the attached ball of clay) rotate?
An aerosol can of whipped cream is pressurized at 440kPa when it's refrigerated at 3 C. The can warns against temperature in excess of 50 C. What is the maximum safe pressure for the can?
Assuming that air resistance exerts a 95 N force on the person during the fall, determine the person's velocity just before hitting the net.