Physics Answers

A lead pellet is propelled vertically upward by an air rifle with an initial speed of 50 ft/s. Find its maximum height ?

A stone is thrown upward with an initial speed of 48 ft/s.

A. what will its maximum height be ?

B. where will it be after 1 s ?

A stone is dropped into a well and 4 seconds later the sound of the splash is heard. If sounds travel at a speed of 340 m/s, how deep is the well ?

The temperature rises by 20°F what is the rise in Celsius scale

The resonant frequency of a closed air column is known to depend on the pressure and density of the air and length of the air column. How do these quantities relate?

A body of volume 36cc floats with ¾ of its volume submerged in water. The density of body is

a) 0.25 g/cc

b) 0.75 g/cc

c) 0.9 g/cc

d) 0.1 g/cc

A JNT delivery man is delivering a big box to a client. He is dragging it up a concrete slope leading to the porch, with an angle of 15° to the horizontal. Then he realized that he is on the wrong location so he again dragged the box down the concrete slope. To get the box started up the slope, it is necessary that the man exert six times the force needed to get it started down the slope. If the force is always parallel to the slope, what is the coefficient of static friction between the box and the concrete?

Two small conducting and identical spheres A and B have charges -25 nC and +15 nC, respectively. They are separated by a distance of 0.02 m. (a) What is the magnitude of the electric force between the two spheres? Is this force attractive or repulsive? (b) The spheres are then allowed to touch each other and then separated. What is the magnitude of the force between the two spheres? Is this a repulsive force or an attractive force?

Blue light leaves a Vacuum (the first medium) and enters a second medium. Which of the following second medium will result in the 2nd greatest amount of bending from the original light path?

a. Vacuum

b. Glass

c. Empty space

d. Diamond

e. Air

f. Water

Which of the fulling results when a wave moves from a medium of a low refractive index to a medium of higher refractive index

a. The wavelength increases

b. The wavelength decreases

c. The wave speed increases

d. Its rays bend away from the normal

e. Its rays bend towards the normal

f. Its rays experience are refracted by exactly 90 es

g. Its rays experience Total Internal Reflection