Physics Alternating Current Level: High School
A chandelier with mass m is attached to the ceiling of a large concert hall by two cables . Because the ceiling is covered with intricate architectural decorations (not indicated in the figure, which uses a humbler depiction), ceiling directly above the chandelier . Instead , they attached the cable to the ceiling near the walls . Cable 1 has tension T1 and makes an angle of theta 1 with the ceiling . Cable 2 has tension T2 and makes an angle of theta 2 with the ceiling .
Find the expression for T1, the tension in cable 1, that does not depend on T2 .
Express your answer in terms of some or all of the variables m ,theta 1, and theta 2 as well as the magnitude of the acceleration due to gravity g .T1 = ?
Physics Force & Laws Of Motion Level: High School
Consider a lawnmower of weight w which can slide across a horizontal surface with a coefficient of friction (u) . In this problem the lawnmower is pushed using a massless handle , which makes an angle (theta) with the horizontal . Assume that Fh , the force exerted by the handle , is parallel to the upward . Find the magnitude , Fh, of the force required to slide the lawnmower over the ground at constant speed by pushing the handle .
Physics Waves And Oscillations Level: High School
The security alarm on a parked car goes off and produces a frequency of 958 Hz .The speed of sound is 343 m/s . As you drive toward this parked car , pass it , and drive away , you observe the frequency to change by 91 Hz .At what speed are you driving ?
Physics Waves And Oscillations Level: High School
A vibrator moves one end of a rope up and down to generate a wave . The tension in the rope is 56 N . The frequency is then doubled . To what value must the tension be adjusted , so the new wave has the same wavelength as the old one ?
Physics Work,Power & Energy Level: High School
collision
In a perfectly elastic collision ,a) momentum is conserved but not kinetic energy .
b) momentum and kinetic energy are conserved .
c) momentum is not conserved but kinetic energy is .
d) neither momentum nor kinetic energy is conserved .
Physics Force & Laws Of Motion Level: High School
A 200 g object is moving in a circle of radius 4m with a uniform speed of 6 m/s . What is the net force acting on the object ?
Physics Alternating Current Level: High School
A crate weighing 550 N is dragged 20 m up a 60 degree incline . the change in the gravitational potential energy of the crate is ?
Physics Work,Power & Energy Level: High School
Elastic Pottial E When a spring with a spring constant K is compressed by a distance x , the potential energy of the spring ,
a) increases by k x
b) increases by ½ kx^2
c) decreases by k x
Physics Work,Power & Energy Level: High School
Collision
A 50 g ball of putty moving with a velocity of 3.0 m/s collides head on with a stationary mass of 50 g and sticks to it . Find the velocity of the mass and putty after the collision .
Physics Work,Power & Energy Level: High School
power
1 watt is the same as (1 Js or 1 Nm or 1 kgm^2/over s^2 or 1 kgm^2 /over s^3).
Physics Work,Power & Energy Level: High School
A 70 kg cart is pushed for 50 m with a constant velocity upon a 45 degree frictionless incline . find the work done on the cart . (assume g = 10 m/s^2) .
Physics Work,Power & Energy Level: High School
A 100 kg object is pulled vertically upward 5 cm by a rope with an acceleration of 1m/s^2 . Find the work done by the tension force in the rope (assume g = 10 m/s^2)
Physics Alternating Current Level: High School
Impulse
A 200 g ball hits a wall perpendicularly with a velocity of 30 m/s and rebounds back with a velocity of 20 m/s . If the collision lasts for 5 ms , find the average force exerted by the ball on the wall ?
Physics Work,Power & Energy Level: High School
Conservation of energy
A simple pendulum with a bob of mass 250 g and length 2.0 m is allowed to fall from a horizontal position . What is the speed of the bob as it passes the lowest point ?
Physics Alternating Current Level: High School
conservatoin of momentum
A 75 kg skater pushes on a 25 kg stationary object on the ice and gives it a velocity of 4.0 m/s find the recoil velocity of the skater .