Physics Force & Laws Of Motion Level: High School
Two dams form artificial lakes of equal depth . However , on lake backs up 15 km behind the dam , and the other backs up 30 km behind , What effect does the difference in length have on the pressure on the dams ?Physics Simple Machines Level: High School
If two identical masses are attached by a light cord which is passing over a mass-less frictionless pulley of an Atwood’s machine , but at different heights , and then released .
Physics Kinematics Level: High School
Conservation of momentum
A 42.0 kg block of ice slides down a plane with an incline of 34 degree’s . Assume friction is negligible , What is the acceleration of the block down the incline ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A golf ball traveling 3 m/s to the right has a head-on collision with a stationary bowling ball in a friction-free environment . If the collision is almost perfectly elastic , What is the speed of the golf ball immediately after the collision ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A 100 kg football linebacker moving at 2 m/s tackles head-on an 80 kg halfback running 3 m/s . Assume the two players were initially running directly at one another . Neglecting the effects due to digging in of cleats .Find their combined velocity .
Physics Waves And Oscillations Level: High School
If a distance to a sound is halved , how will the sound intensity level change ?
Physics Work,Power & Energy Level: High School
A spring with a constant of 225 N/m is horizontally compressed 0.30 . A 0.50 kg is then placed against the spring ( like a pinball ) Determine the velocity of the ball when it reaches the spring’s equilibrium position .
Physics Work,Power & Energy Level: High School
A 1.5 kg object is dropped from a height of 75 m . However , the object reaches the ground only traveling at 33 m/s . Determine how much energy was lost due to air resistance .
Physics Work,Power & Energy Level: High School
A 0.0025 kg bullet traveling at 340 m/s is hot into a gelatinous glob . The bullet then exits the glob with a velocity of 33 m/s . How much work did the glob do to the bullet ?
Physics Rotational Mechanics Level: High School
A merry-go-round of radius R = 2.0 m has a moment of inertia I = 250 kg-m2 and is rotating at 10 rev/min . A 25 kg child at rest , jumps onto the edge of the merry-go-round . What is the new angular speed of the merry-go-round ?a. 10 rev/min M
b. 8 rev/min M
c. 7 rev/min M
d. 6 rev/min M
e. 4 rev/min M
Physics Rotational Mechanics Level: High School
Starts originate as large bodies of slowly rotating gas . Because of gravity , these clumps of gas slowly decreases in size . The angular velocity of a star increases as it shrinks because ofa. Conservation of angular momentum .
b. Conservation of linear momentum.
c. Conservation of gravity .
d. The law of universal gravitation.
e. Conservation of mass .
Physics Rotational Mechanics Level: High School
The position vector of a particle of mass 2.0 kg is given as a function of time by Vector r = (6.0 i + 5.0 t j) meters . What is the angular momentum of the particle (in kg-m2/s) as a function of time ?a. 60 i + 50 t 2 j .
b. 12 i + 10 tj .
c. 50 k .
d. 60 k .
e. Impossible to determine .
Physics Rotational Mechanics Level: High School
A puck of a frictionless air hockey table has a mass of 5 g and is attached to a string passing through a hole in the surface . The puck is revolving at a distance 2 meters from the hole with an angular velocity of 3 rad/s. The string is then pulled from below shortening the radius to 1 meter . The new angular velocity (in rad/s) is Diagram of a puck .1.4
2.6
3.12
4.2
5.8
Physics Rotational Mechanics Level: High School
At a certain instant the position of a stone in a sling is given by Vector r = (1.7i) meter . The linear momentum Vector of the stone is (12 j ) kg m/s . What its angular momentum Vector L = Vector r x Vector p ?a. 0
b. (20.4 k)kg m2/s
c. (20.4 j) kg m2/s
d. (20.4i) kg m2s
e. (10.0 k) kg m2/s
Physics Rotational Mechanics Level: High School
A bicycle wheel has a radius R = 32.0 cm and a mass M = 1.80 kg which you may assume to be concentrated on the outside radius . A resistive force f = 120 Newtons is applied to the rim of the tire . You are to apply a force F so that the wheel has an angular acceleration alpha = 4.50 rad/s2 . What is the strength of the applied force if the radius r of the sprocket is 4.5 centimeters ? Diagram of a bicycle wheela. 255 Newtons
b. 317 Newtons
c. 480 Newtons
d. 667 Newtons
e. 872 Newtons
