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A person sitting quietly in a room on a winter day may lose heat primarily by radiation from the outer surface of her clothes to the walls of the room. what is the temperature of the outer surface o
Ice of mass 48.5 g at -10.3° C is added to 188 g of water at 14.2° C in a 108 g glass container of specific heat 0.200 cal/g-°C, obtain the final temperature of the system
Light is shining perpendicularly on the surface of the earth with an intensity of 131 W/m2. determine the number of photons per second per square meter that reach the earth
A large laser emits an intense pulse of light delivering an energy of 5020J in 1.28×10-2s. how many photons are emitted in this pulse
A playground merry-go-round of radius R = 1.60 m has a moment of inertia I = 275 kg · m2 and is rotating at 8.0 rev/min about a frictionless vertical axle. What is the new angular speed of th
A 15-g sample of the candy is placed in a small aluminum container of mass 0.325 kg filled with oxygen. Determine the Calorie content of 69g of candy
A Hydrogen atom has one proton in the nucleus and one electron in the shell. In a classic model of the atom, What is the radius of the orbit
A long straight wire suspended in the air carries a conventional current of 8.2 amperes in the ?x direction, What is the (vector) magnetic field due to the wire at the location of the electron
A large block of copper initially at 20.0oC is placed in vat of hot water (80.0oC). For the first 1.0 J of heat that flows from the water into the block, find the entropy change of the block
You connect five identical resistors in series to a battery whose EMF is 12.0 V and whose internal resistance is negligible. obtain the potential difference across each resistor
On a part-time job, you are asked to bring a cylindrical iron rod of density 7800kg/m^3, length 91.5cm, obtain the weight of the rod
Two resistors, of R1 = 2.93 ? and R2 = 6.69 ?, are connected in series to a battery with an EMF of 24.0 V, Find the current I1 through the first resistor
Four wires meet at a junction. In two of the wires currents I1 = 1.51 A and I2 = 2.99 A enter the junction. Find the current in the fourth wire
Each plate of a parallel-plate capacitor is a square of side 0.0375 m and the plates are separated by 0.449 × 10-3 m. Find the electric field strength inside the capacitor
A parallel combination of a 1.11-?F capacitor and a 2.89-?F one is connected in series to a 4.65-?F capacitor. compute the charge of each capacitor
You have two capacitors, one with capacitance 12.3 × 10-6 F and the other of unknown capacitance. obtain its capacitance
After sliding across the horizontal surface, the block of mass M collides elastically with a vertical rod of length R and mass MR that is pivoted at the upper end. What is the maximum displacement a
Mars has a mass of 6.4*10^23 kg and radius of 3,400,000 m. find the acceleration due to the gravity on Mars
A spacecraft approaching the earth launches an exploration vehicle. What is the speed of the exploration vehicle relative to the spaceship
a rotating merry-go-round is essentially a disk with mass of 250 kg an radius of 2.5m, Determine the final angular speed of the merry-go-round/son combination
If the near-point distance of the jeweler is 21.8cm, find the angular magnification when the diamond is held 5.74cm from the magnifying glass
The 15g head of a bobble-head doll oscillates in SHM at a frequency of 4.0Hz. What is the head's time constant
You place an ice cube in a microwave oven. If it requires 32,220 J to melt the ice cube and the oven delivers 97 W of power to the ice cube
A man does 4,735 J of work in the process of pushing his 2.70 103 kg truck from rest to a speed of v, over a distance of 25.0 m. determine the horizontal force exerted on the truck
A 3.2 kg sloth hangs 3.2 m above the ground. What is the speed of the sloth at this time