27. suppose two stars are located in region a of the h-r diagram shown in the figure below. star x appears much dimmer than star y as see from earth. which star can be inferred to be nearer to earth, and how do you know?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.