How many grams of ethanol (density 0.80 g/cm3 ) should be added to 5.0 g of chloroform (density 1.5 g/cm3 ) if the resulting mixture is to have a density of 1.2 g/cm3? Assume that the fluids do not change their volumes when they are mixed
A) 2.0 g
B) 2.4 g
C) 1.8 g
D) 4.4 g
E) 1.6 g
A
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A potter's wheel, with rotational inertia 46 kg?m2, is spinning freely at 40 rpm. The potter drops a lump of clay onto the wheel, where it sticks a distance 1.2 m from the rotational axis
If the subsequent angular speed of the wheel and clay is 32 rpm what is the mass of the clay? A) 8.0 kg B) 5.4 kg C) 7.0 kg D) 8.8 kg
Why are troops instructed to break step when they are marching over a bridge?
What will be an ideal response?
A ball is thrown straight up in the air. At what position is its kinetic energy a maximum? At what position is the gravitational potential energy of the ball-Earth system a maximum? Consider only the trip up
1.The maximum kinetic energy occurs at the top of the ball's trajectory and the maximum gravitational potential energy occurs at the top of the ball's trajectory. 2.The maximum kinetic energy occurs at the point of release and the maximum gravitational potential energy occurs at the point of release. 3.The maximum kinetic energy occurs at the point of release and the maximum gravitational potential energy occurs at the top of the ball's trajectory. 4.The maximum kinetic energy occurs at the top of the ball's trajectory and the maximum gravitational potential energy occurs at the point of release.
The ground state configuration for an element is 1s22s22p63s23p1 . What is the atomic number of the element?
a. 11 b. 9 c. 24 d. 13