hunterhood

1. Calculate the quantity of heat energy which must be transferred to 2.25 kg of brass to 
raise its temperature from 20 ℃ to 240 ℃ if the specific heat of brass is 394 J.kg-K.

2. Find the change in temperature produced by 10 kJ of heat energy added to 500 g 
copper. Specific heat of copper 0.39 kJ/kg-K.

3. Explain why, for a gas, the specific heat at constant volume has a different value 
from the specific heat at constant pressure.
An ideal gas is contained in a cylinder fitted with a piston. Initially the temperature of the 
gas is 15℃. If the mass of the gas is 0.035 kg, calculate the quantity of heat energy 
required to raise the temperature of the gas to 150 ℃ when:
(a) The piston is fixed;
(b) The piston moves and the pressure is constant.
For the gas, 𝑐𝑣 = 676 J/kg-K and 𝑐𝑝 = 925 J/kg-K.

1. A box weighs 45 N. Calculate the work done in lifting the box through a vertical height of 

(a) 4.0m.

(b) 67 cm.

What is the coefficient of velocity?

What is the best equation/sequence for this question?

Standing on level ground, a person casts a shadow 1.97 m long when the Sun is 59.5 degrees above the horizon. How tall is the person? Give your answer in meters.

How much would you need to deposit in an account now in order to have $5000 in the account in 10 years? Assume the account earns 7% interest compounded monthly. Round to the nearest cent.

Convert speed of light to miles per hour?

Convert to miles/hour?

Convert 13.6 meters to miles

How to convert ?

how to convert m/s to km/hr?

Convert 8m/s2 to km/s2

Diana invested $3000 in a savings account for 3 years. She earned $450 in interest over that time period. What interest rate did she earn? Use the formula I=Prt to find your answer, where I is interest, P is principal, r is rate and t is time. Enter your solution in decimal form rounded to the nearest hundredth. For example, if your solution is 12%, you would enter 0.12.

Calculate the density in g/L of 478 mL of krypton at 47° C and 671
mmHg

How does friction affect the net force on an object?

A container holds 50.0mL of nitrogen at 25C and a pressure of 736mmHg. What will be its volume if the temperature increase by 35C?

Dan bought 6 new baseball trading cards to add to his collection. The next day his dog ate half of his collection. There are now only 35 cards left.

How many cards did Dan start with?

A 2.75 kg particle moves as function of time as follows: x(t) = 5cos(1.25t+π/4); where 
distance is measured in meter and time in seconds. (a) What is the amplitude, frequency, 
angular frequency, and period of this motion? (b) What is the equation of the velocity of 
this particle? (c) What is the equation of the acceleration of this particle? (d) What is the 
spring constant? (e) What are the equations for the potential and kinetic energies of the 
particle? (f) What is the total energy?

A block, mass m = 6 kg, is pulled from rest (v0 = 0) to the right by a constant horizontal force F = 12 N. After it has
been pulled for d = 3 m, find it’s final speed v