A student of classical physics says, "A charged particle, like an electron orbiting in a simple atom, shouldn't have only certain stable energies; in fact, it should lose energy by electromagnetic radiation until the atom collapses." Answer these two complaints qualitatively, appealing to as few fundamental claims of quantum mechanics as possible.

Use the formula to determine the value of the indicated variable for the values given. Use a calculator when one is needed. When necessary, use the π key on your calculator and round answers to the nearest hundredth.

$$s=-16t^2+v_0t+s_0$$

; determine s when t=4,

$$v_0=30$$

, and

$$s_0=150$$

(physics).

Why were members of the Third Estate dissatisfied with life under the Old Regime?

In one of the classic nuclear physics experiments at the beginning of the twentieth century, an alpha particle was accelerated toward a gold nucleus, and its path was substantially deflected by the Coulomb interaction. If the energy of the doubly charged alpha nucleus was 5.00 MeV, how close to the gold nucleus (79 protons) could it come before being deflected?

a. What evidence would you give that the printing press had significant influence during the Renaissance?

b. Why did urban life lead to the growing "disenchantment" of the world?

c. Did life improve for most Europeans during the $1500$s?

A radioactive sample contains two different types of radioactive nuclei: A, with half-life 5.0 days, and B, with half-life 30.0 days. Initially, the decay rate of the A-type nucleus is 64 times that of the B-type nucleus. When will their decay rates be equal?

In the physics laboratory, a glider is released from rest on a frictionless air track inclined at an angle. If the glider has gained a speed of 25.0 cm/s in traveling 50.0 cm from the starting point, what was the angle of inlination of the track? Draw a graph of

$$v _ { x } ( t )$$

when the positive x-axis points down the track.

Describe three characteristics of plants that helped them meet the demands of life on land.

The Harris Foundry Company purchased new casting equipment in $2003$ at a cost of $\$ 180.000$. Harris also paid $\$ 35.000$ to have the equipment delivered and installed. The casting machine has an estimated useful life of $12$ years, but it will be depreciated using MACRS over its seven-year class life.

(a) What is the cost basis of the casting equipment?

(b) What will be the depreciation allowance in each year of the seven-year class life for the casting equipment?

Assume the helium-neon lasers commonly used in student physics laboratories have power outputs of $0.500$ $\mathrm{mW}$. $(a)$ If such a laser beam is projected onto a circular spot $1.00 \mathrm{~mm}$ in diameter, what is its intensity? $(b)$ Find the peak magnetic field strength. $(c)$ Find the peak electric field strength.

Which of the international popular culture aspects has the greatest effect on your life? Why?

Write a short story that illustrate the conflict between ideal and real culture in everyday life.

In physics it is shown that the height s of a ball thrown straight up with an initial speed of 96 ft/sec from ground level is $s=s(t)=-16 t^{2}+96 t$ where t is the elapsed time that the ball is in the air. What is the average speed of the ball from t = 0 to t = 2?

Predict at least two ways in which climate change will impact your life.