###### Essentials of College Physics

243 SOLVED PROBLEMS

Question: 11.8

## Armageddon! Goal Link mechanical energy to thermal energy, phase changes, and the ideal gas law to create an estimate. Problem A comet half a kilometer in radius consisting of ice at 273 K hits Earth at a speed of 4.00 × 10^4 m/s. For simplicity, assume that all the kinetic energy converts to ...

(a) Find the volume and mass of the ice. Apply the...
Question: 17.4

## A Platinum Resistance Thermometer GOAL Apply the temperature dependence of resistance. PROBLEM A resistance thermometer, which measures temperature by measuring the change in resistance of a conductor, is made of platinum and has a resistance of 50.0 Ω at 20.0°C. (a) When the device is immersed in ...

(a) Find the melting point of indium. Solve Equati...
Question: 24.7

## A Diffraction Grating GOAL Calculate different-order principal maxima for a diffraction grating. PROBLEM Monochromatic light from a helium–neon laser (λ = 632.8 nm) is incident normally on a diffraction grating containing 6.00 × 10³ lines/cm. Find the angles at which one would observe the ...

Invert the number of lines per centimeter to obtai...
Question: 23.1

## A man 1.80 m tall stands in front of a mirror and sees his full height, no more and no less. If his eyes are 0.14 m from the top of his head, what is the minimum height of the mirror? ...

We need to find BE, which equals d. Relate this le...
Question: 6.4

## The Ballistic Pendulum Goal Combine the concepts of conservation of energy and conservation of momentum in inelastic collisions. Problem The ballistic pendulum (Fig. 6.10a) is a device used to measure the speed of a fast-moving projectile such as a bullet. The bullet is fired into a large block of ...

Use conservation of momentum, and substitute the k...
Question: A.1

## A ball is dropped from the top of a building 50.0 m tall. How long does it take for the ball to fall to a height of 25.0 m? ...

First, write the general ballistics equation for t...
Question: A.2

## A block of mass m slides over a frictionless surface in the positive x-direction. It encounters a patch of roughness having coefficient of kinetic friction µk. If the rough patch has length Δx, find the speed of the block after leaving the patch. ...

Using the work–energy theorem, we have  \fr...
Question: A.4

## A ball is projected upwards at 16.0 m/s. Use the quadratic formula to determine the time necessary for it to reach a height of 8.00 m above the point of release. ...

From the discussion of ballistics in Chapter 2, we...
Question: A.5