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Q. A certain brand of hotdog cooker works by applying a potential difference of 142 V across opposite ends of a hot dog and allowing it to cook by means of the thermal energy produced. The current is 13.4 A, and the energy required to cook one hot dog is 60.7 kJ. If the rate at which energy is supplied is unchanged, how long (in s) will it take to cook three hot dogs simultaneously?
Q. A copper wire of cross-sectional area 2.40 × 10-6 m2 and length 3.40 m has a current of 2.00 A uniformly distributed across that area. (a) What is the magnitude of the electric field (in N/C or V/m) along the wire? (b) How much electrical energy is transferred to thermal energy in 35.0 min?
The proper length of one spaceship is 2.8 times that of another. The two spaceships are travelling in the same direction and, while both are passing overhead, an Earth observer measures the two spaceships to be the same length.
The diameter of the He atom is approximately 0.10nm. Compute the density of the He atom in (assuming that it is a sphere).
A motorist travelling at 82 km/hr is being chased by a police car at 131 km/hr. If the police car starts from 3.5 km back, how long does it take to catch the motorist? Leave time in hours.
Intuitively, the man will not catch the bus unless he is running fast enough. In mathematical terms, there is a constraint on the man's speed so that the equation above gives a solution for that is a real positive number.
A meter stick lies on the bottom of a 100 cm long tank with its zero mark against the left edge. You look into the tank at a 30 angle, with your line of sight just grazing the upper left edge of the tank.
Two plane mirrors facing each other are 10 m apart. A woman stands 3 m from one of the mirrors and looks at the mirror and sees two distinct images. How far are these images from the woman.
How much energy is transferred to the water as heat
A young boy swings a yo-yo horizontally above his head at an angular acceleration of 0.32 rad/s^2. If the tangential acceleration of the yo-yo at the end of the string is 0.15 m/s^2, how long is string.
What is the magnetic field strength
A surface is infinitesimally close to and surrounds a dipole. The electric flux during the surface must be zero, since the net charge it surrounds is zero. How is it possible for the dipole to have an electric field and be consistent with Gauss' t..
Television sets sometimes use a rabbit ears antenna to the right. A rabbit-ears antenna consists of a pair of metal rods. The length of each rod can be adjusted to one quarter of the wavelength of an electromagnetic wave whos frequency is 125 Mhz...
What is magnetic flux through the desk surface
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