Physics Answers

1. Copper shot (0.100 kg) is heated in boiling oil. After this, it is submerged in old water (0.300 kg at 20 ºC). If the water’s temperature turned 23.0 ºC, what was the temperature of the hot oil?

2. What is the new length of a bar made of pure gold at 75 ºC if it has a length 0.3 meters at 10 º C?

3.At what temperature will the Celsius and Fahrenheit scale have the same value?

By how much will this area (in square decimeters) increase during a hot summer day on the month of May when the temperature is 120.20F?

When a T. rex pursues a jeep in the movie Jurassic Park, we see a reflected image of the T. rex via a side-view mirror, on which is printed the (then darkly humorous) warning: “Objects in mirror are closer than they appear.” Is the mirror flat, convex, or concave?

A penguin waddles along the central axis of a concave mirror, from the focal point to an effectively infinite distance.(a) How does its image move?(b) Does the height of its image increase continuously, decrease continuously, or change in some more complicated manner?

What is the kinetic energy of an electron having a rest mass of 9.1 x 10^-31 kg traveling at 65% speed of light?

Ultraviolet light of wavelength 350 nm and intensity 1.00 W/m2

is directed at a potassium

surface. (a) Find the maximum KE of the photoelectrons. (b) If 0.50 percent of the incident

photons produce photoelectrons, how many are emitted per second if the potassium surface

has an area of 1.5 cm2

?

What is the maximum wavelength of light that will cause photo electrons to be emitted

from sodium? What will the maximum kinetic energy of the photo electrons be if 200-nm

light falls on a sodium surface?

a man 1.30 m tall stands 5.20 m from a concave mirror. if the image could be formed on a screen 15, what is the size of the images?

A block of ice weighs 950 N and was placed on a metal surface that has a coefficient of friction of μ = 0.12. How much friction is present? *

Two rugby players run towards each other and have an inelastic collision. Given the mass 70 kg and 60 kg respectively, and velocity 3 ms-1 and 4 ms-1. Calculate the final velocity and its direction of the respective players. Discuss how a rugby player’s bone develops if continuously performing the weight bearing exercise using Wolff’s Law and bone remodeling theory