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What mass of water at 23.0°C should be allowed to come to thermal equilibrium with a 1.57-kg cube of aluminium initially at1.50 multiplied by 102 °C to lower the temperature of the aluminium to 69.8 °C? Suppose any water turned to stream subsequently re-condenses.
In a church choir loft, two parallel walls are 5.88 m apart. The singers stand against the north wall. The organist faces the south wall, sitting 0.619 m away from it. So that she can see the choir, a flat mirror 1.147 m wide is mounted in the south ..
A small branch is wedged under a rock and rest on a smaller object. The smaller object is 1.0 m from the large rock and the branch is 4.0 m long. what force must be exerted on the smaller rock
question a point on the rim of a 0.60 m diameter grinding wheel changes speed uniformly from 10 ms to 25 ms in 9.5 s.
If a bungee cord is stretched horizontally to a length of 2.0m , the tension in the cord is 1.9N. What is the tension in the 3.8-m-long cord
What is an approximate absorbed dose rate in Gy per day in water at the center of the bucket if 163 atoms of Cs-137 disintegrate per g s? Use the straight-ahead approximation and mean-radius method of calculating the photon dose. Give the answers for..
A bare helium nucleus has two positive charges and a mass of 6.64 multiplied by 10-27 kg. What voltage would be needed to obtain this energy
Radiation from the nearby star Alpha Centauri is observed to be reduced in wavelength (after correction for Earth's orbital motion) by a factor of 0.999933. What is the recession velocity (direction) of Alpha Centauri relative to the Sun
A lead block is suspended from the underside of a 0.8 kg block of wood of density of 720 kg/m3. what is the mass of the lead block
a grindstone has a radius of 6.00 cm and rotates at 7000 rpm. What is the linear speed of a point on its edge
A fish takes the bait and pulls on the line with a force of2.5 {\rm N}. What is the angular acceleration of the fishing reel
A laser (wavelength 600nm) passes through a 2.44mm circularapertue and hits a screen 1km away. What is the diameter of the spot on the screen
Three charges sit at the corners of an equilateral triangle with sides of length d = 3cm. Calculate the electric potential at the centre of the triangle
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