Physics Waves And Oscillations Level: Misc Level
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes the wave 0.800 s to reach the opposite tower, 20.0 m away. If a 1 - m length of the rope has a mass of 0.350 kg, find the tension in the tightrope.
Physics Waves And Oscillations Level: Misc Level
If the frequency of oscillation of the wave emitted by an FM radio station is 88.0 MHz, determine a. the wave s period of vibration and b. its wavelength. (Radio waves travel at the speed of light.)
Physics Waves And Oscillations Level: Misc Level
A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor and that its period is 15.5 s. a. How tall is the tower? b. If this pendulum is taken to the moon where the free- fall acceleration is 1.67 m/s squared, what is the period there?
Physics Work,Power & Energy Level: Misc Level
A simple harmonic oscillator has a total energy E. a Determine the kinetic and potential energies when the displacement is one- half the amplitude. b. For what value of the displacement does the kinetic energy equal the potential energy?
Physics Work,Power & Energy Level: Misc Level
A slingshot consists of a light leather cup containing a stone. The cup is pulled back against two parallel rubber bands. It takes a force of 15 N to stretch either one of these bands 1.0 cm. a. what is the potential energy stored in the two bands together when a 50 g stone is placed in the cup and pulled back 0.20 m from the equilibrium position? b. with what speed does the stone leave the slingshot?
Physics Properties Of Matter Level: Misc Level
A load of 50 N attached to spring hanging vertically stretches the spring 5.0 cm. The spring is now placed horizontally on a table and stretched 11 cm. a. what force is required to stretch the spring by that amount? b. plot a graph of force(on the y- axis) versus spring displacement from the equilibiirum position along the x- axis.
Physics Properties Of Matter Level: Misc Level
An engine absorbs 1700 J from a hot reservoir and expels 1200 J to a cold reservoir in each cycle. a. what is the engine s efficiency? b. How much work is done in each cycle? c. what is the power output of the engine if each cycle lasts for 0.300 s?
Physics Heat & Thermodynamics Level: Misc Level
A heat engine operates between two reservoirs at temperatures of 20 degrees C and 300 degrees C. what is the maximum efficiency possible for this engine.
Physics Work,Power & Energy Level: Misc Level
A 5.0 kg block of aluminum is heated from 20 degrees C to 90 degrees C at atmospheric pressure. Find a. the work done by the aluminum, b. the amount of energy transferred to it by heat, and c. the increase in its internal energy.
Physics Heat & Thermodynamics Level: Misc Level
Sketch a PV diagram of the following processes:a A gas expands at constant pressure p1 from volume V 1 to volume V2. It is then kept at constant volume while the pressure is reduced to p2. b. A. gas is reduced in pressure from p1 to p2 while its volume is held constant at v1. It is then expanded at constant pressure p2 to a final volume v2 . c. In which of the processes is more work done by the gas?why?
Physics Kinematics Level: Misc Level
A rocket is launched at an angle of 53 degrees above the horizontal with an initial speed of 75 m/s. It moves 25 s along its initial line of motion with an overall acceleration of 25 m/s. At this time its engines fail and rocket proceeds to move as a free body.
A.What is the rockets maximum altitude?
B. What is the rockets total time of flight?
C. What is the rockets horizontal range?
The answeres to these are:
A. 24000 m
B. 152 s
C.78000 m
Physics Heat & Thermodynamics Level: Misc Level
The air at 900 mb has a temperature of 14 C and a dewpoint of 10 C.what is the equivalent potential remperature (Theat-E)of this air?
Physics Heat & Thermodynamics Level: Misc Level
The relative humidity is 60% and the temperature is 80 F. what is the dewpoint (Td) in degrees F?
Physics Heat & Thermodynamics Level: Misc Level
The air at the surface (1000 mb) has a temperature of 20 C and a dewpoint of 15 C. what is the equivalent temperature (Te) of this air?
Physics Heat & Thermodynamics Level: Misc Level
At 1000 mb the mixing ratio is 3g/kg and the saturation vapor pressure is 38 mb. what is the realtive humidity of this air?
