Physics Rotational Mechanics Level: High School
A 500 g steel block rotates on a steel table while attached to a 2.0 –m-long massless rod . Compressed air fed through the rod is ejected from a nozzle on the back of the block , exerting a thrust force of 3.5 N . The nozzle is 70 degrees from the radial line . The block starts from rest . What is the blocks angular velocity after 10 revolutions ? What is the tension in the rod after 10 revolutions ?
Physics Properties Of Matter Level: High School
Bernoulli’s Theorem
Water flows steadily from an open tank into a pipe . The elevation of the top of the tank is 12.5 m , and the elevation at the pipe is 3.30 m . The initial cross sectional area of the pipe (at point 2) is 6.90 x 10^-2 m^2 , and at where the water is discharged from the pipe (at point 3), it is 3.00 x 10^-3 m^2 . The cross sectional area of the tank is very large compared with the cross-sectional area of the pipe .a) Assuming that Bernoulli’s equation applies , compute the volume of water delta V that flows across the exit of the pipe in the time interval 4.90 s .
Physics Rotational Mechanics Level: High School
A string is wrapped around a uniform solid cylinder of radius 2.30 cm. The cylinder can rotate freely about its axis . The loose end of the string is attached to a block . The block has mass 18.6 kg , and the cylinder has mass 12.6 kg .a) Find the magnitude infinite of the angular acceleration of the cylinder as the block descends .
b) What is the acceleration of the block ?
c) what is the tension in the string ?
Physics Work,Power & Energy Level: High School
Inelastic Collision
Block 1, mass m1= 7.10 kg , moves along a frictionless air track with speed v1 = 11.0 m/s . It collides with block 2 of mass m2 = 59.0 kg , Which moves initially with speed 4.30 m/s , toward the first block , The block stick together after the collision .a) Find the magnitude P1 of the total initial momentum of the two-block system .
b) Find , the magnitude of the final velocity of the two-block system .
c) What is the change delta K= K final – K initial in the system’s kinetic energy due to the collision ?
Physics Kinematics Level: High School
One dimensional Motion
A boy of mass 37.5 kg jumps off a diving platform 2.24 m high . He lands in the water and goes under a distance 1.67 m before he stops.a) What is the boys initial potential energy using the lowest point he reaches as the reference height (h= 0) ?
b) What is the boys velocity when he hits the water ?
c) What is the magnitude of the resistive force of the water on the boy ?
Physics Kinematics Level: High School
Relative Velocity
Consider a antelope being chased by a tiger . The antelope is running at a velocity of 6.91 m/s at an angle 14.7 degrees E of S . The tiger is running at a velocity of 10.91 m/s at an angle of 30 degrees W of S .(Use East as positive x and North as positive y)a) What are the x and y component of the antelope’s velocity with respect to the ground ?
b) What are the x and y component of the tiger’s velocity with respect to the ground ?
c) What are the x and y component of the velocity of the tiger with respect to the antelope ?
d) What is the magnitude of the velocity of the tiger with respect to the antelope ?
e) If the tiger and the antelope are 126 m apart ,how long will it take the tiger to catch the antelope ?
Physics Kinematics Level: High School
Projectile Motion
A cannonball is shot from a cannon on a cliff at a height of 11.8 m at a ship on the ocean . The cannonball is shot with an initial velocity of 16.4 m/s at an angle to 49.9 degrees above the horizontal .a) What are the x and y component of the initial velocity ?
b) What is the total maximum height of the cannonball ?
c) What is the total time in the air for the cannonball ?
Physics Work,Power & Energy Level: High School
A small pond of 2 meters diameter holds 500 kg of water . If energy from sunlight is absorbed by the pond’s surface at a rate of 400 J/s per square meter , with no energy losses , what energy does the pond absorb per sound ?
Physics Work,Power & Energy Level: High School
Electric Power
What is the power output of an electrical device that uses 400 Joules of energy in 4 seconds ?
Physics Rotational Mechanics Level: High School
Rotational Equilibrium
Two children sits on opposite direction ends of a light board of length 4 meters , pivoted about the middle . Child 1 has a mass of 20 kg and the Child 2 has mass 30 kg . The children are trying to balance the system with the board horizontal , by having only one of them move. Which child should move , and to what position , in order to balance the board ?
Physics Waves And Oscillations Level: High School
A swing swings 5 meters along the arc of a circle , and the back again repeatedly . What is the amplitude of this motion ?
Physics Waves And Oscillations Level: High School
Speed of Sound
How long does it take the sound of a thunderclap to reach your ears , if you are 2 kilometers away from the source of the sound ?
Physics Properties Of Matter Level: High School
Gas
The pressure of a gas held at constant temperature is inversely proportional to the volume. Express the pressure P1 of a gas with the volume of 10 liters in terms of the pressure P2 when the volume is only 1 liter ?
Physics Force & Laws Of Motion Level: High School
A book of mass m 1kg slides across an ordinary table . What forces act on the book ?
Physics Force & Laws Of Motion Level: High School
Momentum
A car of mass 1000 kg moves with a speed of 20 m/s directly north . What is the car’s momentum ?