1. At t=0, a fly wheel has an angular velocity of 4.7 rad/s (radians per second), an angular acceleration of -0.25 rad/s^2 , and a reference line at pheta0 = 0. (a) Through what maximum angle phetamax will the reference line turn in the positive direction ? At what times t will the reference line be at (b) pheta = 1/2phetamax an
See attached files. Physics test prep questions
See attached graph. A solid door of mass M = 20kg and width l= 1m is hit at a right angle by a mud ball of mass m = .5kg, which hits the door at the edge with speed v= 10m/s and sticks. (a) What is the rotational inertia of the door about the hinges? (b) What is the angular velocity of the door after having been struck?
Refer to attachment for 9 Physics problems.
A 25kg ball is thrown 18m up in the air. What is it's initial velocity?
Determine trigonometrically the magnitude and direction of the velocity of a plane that is flying west at 100.0km/h with respect to the air while the wind is blowing toward the north at 65.0 km/h relative to he ground.
Q. a 4kg object resting on a pole 8m tall is struck by a 20 gram bullet, which is moving horizontally at 200 m/sec. the bullet remains embedded in the object. a. What horizontal velocity does the object acquire? b. How far from the base of the pole does the object strike the ground?
Q. A boy throws a stone from the edge of a cliff with an initial speed (Vo) at an angle of 30 degrees above the horizontal. when it hits the surface of a lake 22m below the top of the cliff, the stone is moving at a speed of 25 meters per second. what was its initial velocity.
A solid sphere of uniform density starts from rest and rolls without slipping a distance of d = 4.2 m down a q = 23° incline. The sphere has a mass M = 4.1 kg and a radius R = 0.28 m. a) Of the total kinetic energy of the sphere, what fraction is translational? b) What is the translational kinetic energy of the sphere when i
Hi. Here's a tricky one (for me, anyway): "A train has a mass of 5.07 x 10^6 kg and is moving at 75.5 km/hr. The engineer applies the brakes, which results in a net backward force of 1.71 x 10^6 N on the train. The brakes are held on for 26.0 s. What is the new speed of the train?" Thank you!
1. A luge and its rider, with a total mass of 85 kg emerges from a downhill track onto a horizontal straight track with an initial speed of 37 m/s. If they stop at a constant deceleration of 2.0 m/s^2, (a) What magnitude F is required for the deceleration force, (b) what distance "d" do they travel while decelerating (c) what wo
See attached Word file. Romeo is chucking pebbles as gently as he can up to Juliet's window. That is, he wants the pebbles to hit the window with the least possible speed, as shown in the figure below. He is standing at the edge of a rose garden at H = 7.40 m below her window and at D = 8.60 m from the base of the wall. How f
See attached Word file. The pictures show cannonballs of two different masses projected upward and forward. The cannonballs are projected at various angles above the horizontal, but all are projected with the same vertical component of velocity. Which of the following statements are true about the situations depicted in t
Car A accelerates from rest with 2m/sec^2 and Car B is moving with a constant velocity of 25 m/s. at the instant t=0. Determine (a) distance between the two cars at t=5 sec. (b) time for the cars to arrive at the same location. (c) distance of car A from the origin when they arrive at the same location. (d) speed
A rigid rod with negligible mass has a length L= 2.6 m. The rod can rotate freely about a fixed pivot at one end. Attached at the other end of the rod is mass M1 = 8.4 kg, and at its center is mass M2 = 3.6 kg. The system is released from vertical at rest to rotate about the pivot. SEE ATTACHMENT #1 for a diagram showing parame
A projectile is fired in such a way that its horizontal range is equal to three times its maximum height. What is the angle of projection?
Physics question with drawing attached
On a country road, a car whose mass is 1800 kg drives over a bridge which forms a circular arc whose radius is 80 meters. PART a. Find the maximum speed of the car at the highest point of the bridge, in order that the car barely remains in contact. PART b. If the speed of the car at the highest point is 21 m/sec, find t
SEE ATTACHMENT #1 for a diagram showing known parameters. A crate whose mass is 1600 kg, suspended from a cable, is initially moving downward at 12 m/sec. It is brought to a stop in 42 m distance. Find the force in the cable.
A marble is fired from ground level. At a height of 9.1 m, its velocity is v=7.6 i + 6.1 j in which (i and j are unit vectors). Find the maximum height attained and the total flight time from release to impact.
A rock is dropped off the side of a bridge and hits the water below 2 seconds later. What was the rock's velocity when it hit the water? What was the rock's average velocity as it fell?
SEE ATTACHMENT #1 for a diagram showing known parameters. A boat leaves one bank of a river and heads in such a direction as to arrive at a point downstream and across the river. A certain river is 2000 meters wide and flows Southward at 6.2 m/sec. The boat's speed relative to the water is 15 m/sec. From a point on the Wes
A rock is given initial upward velocity of 49 m/sec at ground level. Find the change in height in the last 1.5 seconds of its upward motion.
Until 1883, every city and town in the US kept its own local time. Today, travelers reset their watches only when the time change equals 1.0h. How far, on the average must you travel in degrees of longitude until your watch must be reset by 1.0h? (hint: Earth rotates 360 degrees in about 24 hours ) Gold, which has a mass of
A 1000-kg Volkswagen with speed 30m/sec collides head-on with a large truck of mass 10,000kg and speed 25m/sec. As a result of the collision, the two vehicles lock together. a. Find the magnitude and the direction of the velocity of the vehicles right after the collision. b. Compute the total Kinetic energies before
A wave having frequency 20Hz and wavelength 5m is traveling away from its source. What is the distance traveled by this wave in 15 sec?
A man whirls a stone round his head on the end of a string 2 m long. Can the string be in a horizontal plane ? If the stone has a mass of 200g and the string will break if the tension exceeds 4 Newton, what is the smallest angle the string can make with the horizontal ? What is then the speed of the stone ? Take g = 10m/s^2
A constant force acts on a 2kg mass for 3sec while the velocity changes from 4m/sec to 10m/sec. a. Find the initial and final momentum of the mass. b. Find the change in momentum and the impulse given to the mass. c. Find the magnitude of the force.
A 30kg girl moving with speed 2m/sec and a 50kg boy moving with speed 1m/sec collide head-on on an ice-skating rink. As a result of the collision, the girl moves at 1m/sec opposite to her initial direction. Find the magnitude and direction of the boy's velocity after the collision.
A 3000kg truck crashes into a wall at 40km/hr and comes to a stop in 0.5 sec. What is the average force on the truck while it comes to a stop?