Physics Work,Power & Energy Level: High School
A package sitting on a shelf 2m high is knocked off , calculate the velocity of the box when it hits the floor , using a displacement / velocity / acceleration equation and conservation of energy .
Physics Rotational Mechanics Level: High School
A person with a ponytail 25 cm long , is using a lathe which is turning at 300 rpm . The person turns their head , catching the end of the ponytail in the workplace , which has a diameter of 7 cm . How long will take the person’s head to be dragged into the lathe ?
Physics Properties Of Matter Level: High School
Use the concept of acceleration , force and yield strength to explain why delicate goods shipped in cardboard box are often fires packed in polystyrene polyurethane foam ?
Physics Properties Of Matter Level: High School
Elasticity A material has a breaking stress of 700 MNm-2 . What mass could be hung from a cable of this material if the diameter of the cable was 4 mm ?
Physics Properties Of Matter Level: High School
Archimedes Principle
A 600 kg weather balloon is designed to lift a 4000 kg package . What volume should the balloon have to after being inflated with helium at standard temperature and pressure (1.013 x 10^5 Pa)
Physics Properties Of Matter Level: High School
Archimedes Principle
A bathysphere has a radius of 1.5 m and a mass of 1.2 x 10^4 kg . In order to dive , the sphere takes on mass in the form of sea water . Determine the mass of the sea water the sphere takes on so it can descend at a constant speed of 1.2 m/s when the resistive force on it is 1100 N upward . The density of sea water is 1.03 x 10^3 kg/m^3 .
Physics Properties Of Matter Level: High School
Archimedes Principle
An empty super balloon has a mass of 0.012 kg . The balloon is filled with He at S = 0.181 kg/m^3 . At this S , the balloon has a radius of 0.5 m . If the balloon is fastened to a vertical line , What is the tension in the line ?
Physics Properties Of Matter Level: High School
Archimedes Principle
A small ferry boat is 4 m wide and 6 m long . When a loaded truck pulls onto it , the boat sinks an additional .04 m into the river . What is the weight of the truck ?
Physics Properties Of Matter Level: High School
Equation of Continuity
Calculate the mass flow rate (in g per second ) of blood (density = 1.0 g/cm^3) in an pipe with cross-sectional area of 2.0 cm^2 if the flow speed is .4 m/s . Assume that the aorta branches out into capillaries with a cross sectional area of 3 x 10^3 cm^2 , what is the flow speed in the capillaries ?
Physics Ray Optics Level: High School
In a thin water film in air , there are exactly 80 wavelengths of blue light inside the film . The reflected light from the two surface of the film will ?a) Be brightest in the blue part of the spectrum
b) Have the normal amount of blue light
c) None of the options
d) Be deficient in blue light
Physics Properties Of Matter Level: High School
Pressure
When the two arms of a U-tube manometer containing mercury are connected to two chambers , the difference in the heights of mercury in the two arms is 4.5 cm . What is the difference in pressure between the chambers ?a) 6.0 x 10^5 Pa
b) 1.0 x 10^4 Pa
c) 1.0 x 10^5 Pa
d) 6.0 x 10^3 Pa
Physics Rotational Mechanics Level: High School
Two wheels with rotational inertias 1.0 kg m^2 and 1.5 kg m^2 are rotating on the same axis at 20 rad/s and 12 rad/s respectively , in opposite directions . If the wheels are suddenly coupled together , find the common angular speed of the wheels after coupling .a) 0.80 rad/s
b) 9.1 rad/s
c) 0.40 rad/s
d) 0.57 rad/s
Physics Force & Laws Of Motion Level: High School
Impulse
A 200 g ball hits a wall perpendicular with a velocity of 30 m/s and rebounds with a velocity of 20 m/s . If the collision lasts for 5 milliseconds , find the average force exerted by the ball on the wall .a) 1000 N
b) 4000 N
c) 6000 N
d) 2000 N
Physics Waves And Oscillations Level: High School
A transverse traveling wave is described by the equation , where x and y are in meters , and t in seconds . The wavelength and frequency of the wave are :a) 0.25 m and 2 Hz
b) 0.25 m and 0.5 Hz
c) 4 m and 0.5 Hz
d) 4 m and 2 Hz
Physics Rotational Mechanics Level: High School
The coordinates of three particles are (5,7) , (0,3) and (-1,-1) . If the three particles have masses of 1.0 kg , 2.0 kg and 2.0 kg respectively , find the coordinates of the center of mass .a) (0.6 , -2.2)
b) (0.6 , 2.2)
c) (-0.6 , 2.2)
d) (-0.6, -2.2)
