Two blocks are free to slide along the frictionless wooden track shown below. The block of mass m₁ = 5.06 kg is released from the position shown, at height h = 5.00 m above the flat part of the track. Protruding from its front end is the north pole of a strong magnet, which repels the north pole of an identical magnet embedded in the back end of the block of mass m₂ 11.0 kg, initially at rest. The two blocks never touch. Calculate the maximum height to which m₁ rises after the elastic collision. 1.01 x m m My

Describe the basic features of the “lighthouse” model of a pulsar, and indicate how they combine to give rise to the observed sharply pulsed radio emission from these sources.

(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . A simple electric circuit consists of a constant-voltage power supply and a variable resistor. What effect does reducing the resistance have on the current in the circuit and on the power output of the power supply?

If a marathon runner averages 9.5 mi/h, how long does it take him or her to run a 26.22-mi marathon?

Electric bills from power companies charge for so many kilowatt-hours (kWh). What are we paying for?

The goal in this problem is to find the growth of an ice layer as a function of time. Call the thickness of the ice layer L. (a) Derive an equation for dL/dt in terms of L , the temperature T above the ice, and the properties of ice (which can leave in symbolic form instead of substituting the numbers). (b) Solve this differential equation assuming that at t=0 , you have L=0 . If you have studied differential equations, you will know a technique for solving equations of this type: manipulate the equation to get dL/dt multiplied by a (very simple) function of L on one side, and integrate both sides with respect to time. Alternatively, you may be able to use your knowledge of the derivatives of various functions to guess the solution, which has a simple dependence on t. (c) Will the water eventually freeze to the bottom of the flask?

(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . Explain what current, resistance, and voltage are.

A metal is used to conduct heat between two reservoirs at temperatures Th and Tc , respectively. When an amount of heat Q flows through the rod from the hot to the cold reservoir, what is the net entropy change of the rod, the hot reservoir, the cold reservoir, and the universe?

Check Your Understanding How much energy does a 1.5-V AAA battery have that can move 100C ?

Mechanisms of Heat Transfer What are the main methods of heat transfer from the hot core of Earth to its surface? From Earth's surface to outer space?