The adjacent figure shows the characteristic curves C, and C2 of two resistors where the voltage U and the current I through the same resistor are measured in a circuit using the
following instruments: DC generator, rheostat, voltmeter, ammeter, the resistor and connecting
wires.
AUM
114
12._
10 : :
18
6 :
ہ
(m. A.)
20 40 60 80 100 120 140
1. Draw a diagram of the corresponding circuit.
2 Which one of the two resistors has the larger resistance? Why?
3 Calculate the resistance of each one of the two resistors.
4 The two resistors are connected in series across a dry cell that provides a voltage 10V:
à. Draw a diagram representing the circuit.
3
6. Find the resistance of the resistor equivalent to the two resistors. Express it in K22.
c. Calculate the current I in the circuit.
d. Calculate the voltage U, and U2 across each one of the two resistors.
and
.​

Athin, square metal plate measures 14 cm on each side and has emissivity of 0.60. the plate is heated to a temperature of 745°c. what is the rate at which the plate radiates energy ? the stefan-boltzmann constant is 5.67 × 10-8 w/(m2 ? k4). remember that the plate will radiate energy from both its top and bottom surfaces.

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)