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How long (means time) must a 400 W electrical engine work in order to produce 300 kJ of work?
The force between a 100 kg man and the Earth is 980 N. How close must two protons (1.6 X 10-19 C) be to generate the same force?
object traveling at 90% speed of light what would it appear as to observer from sending point ,the object ,and destination point, and from a 4th observation from 90% angle, 4th point is most important and observed effects of movement on spacetime from 4th point...
Two electrons are 10^-5 m apart. One electron is fixed on its position. The other, originally at rest, is released. How fast is the free electron moving when it is 10^−3 m from the fixed charge? Apply conservation of energy.
The displacement of an object is given by x =sin2pi (t+0.01)m. Find amplitude of the oscillatory motion ,time period, maximum velocity , maximum acceleration and initial displacement
A piece of copper 700g is heated to100°c and then quickly transferred to a copper calorimeter of mass 20g containing 500g of liquid of unknown specific heat capacity of liquid calculate the specific heat capacity of copper 3900j/kg
Suppose the area of a window on a passenger jet is doubled in size
and all else is kept constant. Compared with the original window,
what will happen to the rate at which heat passes out through the
new window from the cabin?
The temperature on the inside face of a glass window is 20.0 .C
while the outside temperature is 0.00 .C. The window is 100 cm
by 100 cm by 10.0 mm and has a thermal conductivity of 0.85
W/m.K. How much energy passes outward through the glass in
Suppose that the heat flow out of your 20°C home in the winter is 7
kW. If the temperature outside is -15° C, how much power P would an
ideal heat pump require to keep your inside temperature at 20° C?
There is a 70 W heat leak from a room at temperature 22 °C into
an ideal refrigerator. How much electrical power is needed to
keep the refrigerator at -10 °C?
