Search & Filtering
imagine that you are in the car,driving along a main road along the road,there are signs telling you how far it is to the next town at the roadside,there may be marker posts every 100 meters.Describe how you could use these roadsigns to work out the average speed of the car.
A completely sealed container, in the shape of a cube with side panels of length = 0.71 m, is full of carbonic ice at temperature -109.5 °C and placed in a room where the ambient temperature is 28.7 °C. The thickness of each (identical) panel of the container is 2.2 cm. In 1.2 day(s), an amount of 3073661 J of heat is conducted through the panels. Find the thermal conductivity of the material which the panels are made of.
Solar panels on one of the NWU solar car prototype, have an emissivity of e = 0.623. When in direct sunlight, they absorb energy at a rate of 1030 J/s per square meter of surface. Assume that the only energy loss is due to the emission of radiation. What equilibrium temperature are the panels reaching?
In a closed, insulated system, the vapour pressure of water at 15.16 °C is 4720 Pa. What percentage of the standard atmospheric pressure (1 atm) is this?
A sperical capacitor has an inner sphere of raduis 10 cm and an outer sphere of raduis 14 cm
We have 2 kg of ethanol at a temperature of 30 degrees Celsius. The boiling point of ethanol is 80 degrees Celsius. If the specific heat of ethanol is 2400 kJ / kg Kelvin and the latent heat of vaporization is 850000 kJ / kg, how much heat is needed to evaporate 200 g of this ethanol at 80 ° C?
The work functions for three metals X, Y. and Z are 4, 5, and 6 eV, respectively. Photoelectrons are created when UV light shines on these metals. The photoelectrons from which metal would have the largest stopping voltage?
A. Z
B. Y
C. X
A vector A=i+2j+3k and another vector B=2i+j+ck.find c such that A vector parallel to B vector.
Two positive charges of magnitude 2.4 x 10-9 C and 1.6 x 10-9 C are separated in air by a distance of 2cm. how much electrostatic potential is produced by the two charges at midway between them?
The measure of the gravitational force exerted on an object
The measure of gravitational force exerted on an object ,
