Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A simple pendulum is made from a 0.66 m long string and a small ball attached to its free end . The ball is pulled to one side through a small angle and then released from rest . After the bal is released , how much time elapses before it attains its greatest speed ?
Physics Work,Power & Energy Level: High School
Conservation of Energy
A vertical spring with a spring constant of 530 N/m is mounted on the floor . From directly above the spring ,which is unstrained a 0.30 kg block is dropped from rest . It collies with and sticks to the spring ,which is compressed by 2.9 cm in bringing the block to a momentary halt . Assuming air resistance is negligible ,from what height (in cm) above the compressed spring was the block dropped ?
Physics Work,Power & Energy Level: High School
Conservation of Energy
In preparation for shooting a ball in a pinball machine , a spring (k = 680 N/m) is compressed by 0.0685 m relative to its unstrained length . The ball (m = 0.0600 kg) is at rest against the spring at point A . When the spring is released , the ball slides (without rolling to point B , which is 0.300 m higher than point A . How fast is the ball moving at B ?
Physics Waves And Oscillations Level: High School
Bow and Arrow Problem
An arches pulls the bowstring back for a distance of 0.530 m before releasing the arrow . The bow and string act like a spring whose spring constant is 440 N/m .a) What is the elastic potential energy of the drawn bow ?
b) The arrow has a mass of 0.0300 kg . How fast is traveling when it leaves the bow ?
Physics Waves And Oscillations Level: High School
Vertical Spring Simple Harmonic Motion
When an object of mass m1 is hung on a vertical spring and set into vertical simple harmonic motion . Its frequency is 12 Hz .Which another object of mass m2 is hung on the spring along with m1 ,the frequency of the motion is 4 Hz . Find the ratio m2/m1 of the masses .
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A computer to be used in a satellite must be able to withstand accelerations of up to 21 times the acceleration due to gravity . In a test to see if it meets this specification , the computer is bolted to a frame that is vibrated back and forth in simple harmonic motion at a frequency of 8.1 Hz . What is the minimum amplitude of vibration that must be used in this test ?
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A loudspeaker diaphragm is producing a sound for 1.9 s by moving back and forth in a simple harmonic motion . The angular frequency of the motion is 6.84 104 rad/s . How many times does the diagram move back and forth ?
Physics Waves And Oscillations Level: High School
Spring Constant
A 0.78 kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one , and the amount that the spring stretches from its unstrained length quadruples . What is the mass of he second block ?
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A system component is clamped to a vibration testing machine and subjected to sinusoidal vibrations to test the component under conditions of SHM. The amplitude is 2 cm, with a vibration frequency of 25 Hz and the test specifies an acceleration amplitude of 10 g (98.1 m s-2) . The component passes through the origin at time = 0.0 s , traveling in the +y-direction . At what time does the component first pass through the position y = 1.5 cm and what positions will have the speed of 3.0 m s-1 .
Physics Heat & Thermodynamics Level: High School
Which of the following statement are true ?a) The Clausius form of the Second Law of Thermodynamics effectively says that heat will always flow from a colder to a hotter environment .
b) The Third Law of Thermodynamics effectively says that one can never reach a temperature of 0 K
c) The concept of temperature is introduced by the Zeroth Law of Thermodynamics.
d) The three mechanism of energy transfer by heat are convolution , convocation , and radiation .
e) One form of the Second Law of Thermodynamics is that all naturally occurring processes , the entropy of the universe always increases .
Physics Heat & Thermodynamics Level: High School
Calorimetry
To help keep the barn warm on winter days , a farmer stores 750 kg of warm water (20 degree C) in a large vat in the barn . How many hours would a 2.0 kW electric beater have to operate in order to provide the same amount of heat as is given off by the water as it cools down from 20.0 degree C to 0 degreeC and then completely freezes at 0 degree C. (Information about ice and water : c(water) = 4186 J/kg-K , c(ice)= 2090 J/kg-K, Lf(water) = 3.35 x 10^5 J/kg.)a) 30.2
b) 34.2
c) 38.6
d) 43.6
e) 49.3
Physics Heat & Thermodynamics Level: High School
Calorimetry
In the above problem, imagine that copper pellets (with the same mass per pellet)were used instead of lead pellets, In this case , to achieve the same equilibrium temperature , how many copper pellets would you need , compared to the original number of lead pellets ? Which of the following statements are true ?a) You need fewer copper pellets, but more than half the original number
b) You need more copper pellets, in fact, more than double the original number
c) You need fewer copper pellets , less than half the original number
d) You need the same number of copper pellets as silver originally
e) You need more copper pellets, but less than double the original number
Physics Heat & Thermodynamics Level: High School
Calorimetry
Small 1.1 g pellets of lead are heated to a temperature of 90 degree C and then added to a water bath containing 223 grams of water at 23 degree C . How many lead pellets must be added to the water in order to make the equilibrium temperature of the system 30 degree C ? (Specific heats of some metals in J/kg-K: lead (128), silver (234), copper (387) , iron(448) , aluminum (900))a) 582
b) 773-
c) 1029
d) 1368
e) 1820
Physics Heat & Thermodynamics Level: High School
Calorimetry
The specific heat of alcohol is about half that of water . Suppose that you have 0.5 kg of alcohol at room temperature (20 degree C) and 0.5 kg of hot water at 80 degreeC in separate containers . If you now mix these two liquids and allow them to come to thermal equilibrium, what will be the approximate equilibrium temperature (in degree C) of the mixture ? Which of the following statements are true ?a) 60 deg
b) 40 deg
c) 80 deg
d) 50 deg
e) 30 deg
Physics Heat & Thermodynamics Level: High School
Change of Phase
A 21.50 kg block of ice at alcohol of ice at -3.2 degree C slides on a horizontal surface with a coefficient of kinetic friction equal to 0.25 . The initial speed of the block is 6.90 m/s and its final speed is 2.30 m/s . Assuming that all the energy dissipated by kinetic friction goes into melting part of the ice , determine the mass of ice (in grams) that melts , (Information about ice and water : c (water) = 4186 J /kg-K , c(ice) = 2090 J/kg-K, Lf(water) = 3.35 x 10^5 J/kg) .a) 0.85
b) 1.07
c) 1.33
d) 1.66
e) 2.08
