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A house thermostat is normally set to 22°C, but at night it is turned down to 16°C for 9.0 h. Estimate how much more heat would be needed (state as a percentage of daily usage) if the thermostat were not turned down at night. Assume that the outside temperature averages 0°C for the 9.0 h at night and 8°C for the remainder of the day, and that the heat loss from the house is proportional to the temperature difference inside and out. To obtain an estimate from the data, you must make other simplifying assumptions; state what these are.
If a 100 kilogram person was standing in the elevator and it accelerated downward at 3 m/s^2. What is the force acting on the person feet
The best laboratory vacuum has a pressure of about 1 × 10-18 atm, or 1.010 × 10-13 Pa. How many gas molecules are there per cubic centimetre in such a vacuum at 293K.
two particles with Q1=50uc and Q2=84uc are initially separated by a distance of 2.3m, what is the change in electric potential energy
What is current flowing through the collider
A point particle with charge q = 86 µC is placed at a corner of a cube of edge a = 12 cm, What is the flux through each of the other cube faces
a net force described by the equation fxx25x acts on a mass of 3 kg. what is the objects speed after moving a distance
A student doing part B of the experiment drops a ball from h0 = 100 cm, Find the fraction of Kinetic Energy lost in this collision
if a particle undergoes simple harmonic motion (SHM) withamplitude 0.25m, what is the total distance it travels in one period
Radioactive oxygen-15 decays at such a rate that half the atoms in a given sample decay each two minutes. find how many atoms will be left at the end of that time
A certain core material has an actual permeability of 4.40x10^-2H/m. What is the relative permeability of the material
Monochromatic x rays are incident on a crystal for which the spacing of the atomic planes is 0.442. What is the wavelength of the x rays
To measure the static friction coefficient between a 4.33-kg block and a vertical wall, the setup shown in the drawing is used. A spring (spring constant = 461 N/m) is attached to the block.
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