Car A is at rest (0 mi/hr), while car B is going 90m/hr with constant velocity. How fast will car A have to travel from rest in order to catch up to car B over a distance of 3 miles? How long will it take for car A to catch car B?
Why is it more practical to use mercury in a barometer than water?
A car of mass 1000kg moves with a speed of 50 m/s on a circular track of radius 100m. What is the magnitude of its angular momentum (in kg.m^2/s) relative to the center of the racetrack? ============================================== Answers: a) 5 x 10^2 b) 5 x 10^6 c) 2.5 x 10^6 d) 2.5 x 10^4 ############################
1. A ball that weights 5N falls on earth ...what is the net force that acts on the ball during the fall? Which is the force (including its direction) that the ball exercises on the land when it falls? 2. In the moon, the gravitational acceleration of the objects is around 1.67 meter/s2 How much does it weight in the moon an ob
1. If a cord is pulled upward, making an angle of 27º with respect to the horizon line, produces a force of 365N and can pull a box over the floor with a weight of 55.2 kg at a constant speed of 20.5 centimeters/sec - which is the magnitude of the friction force that opposes the movement of the box? 2. A boat pulls a water-ski
1. The position equation for the movement of a particle is given by when s is measured in feet and t is measured in seconds. Find the acceleration at two seconds. 2. Find the derivative: . 3. Find if . 4. The radius of a circle is increasing at the rate of 5 inches per minute. At what rate is the area increasing when
A rock falls from the top of a building, passing a window in a known time. Find the height of the building.
A rock is released at rest from the top of a building. A window of the building which measures d=3.5 m from top to bottom. Its bottom edge is distance h=36 m from the ground. The rock takes time T= .12 seconds to pass from the top to the bottom of the window. a. find the height of the building. b. find the time the rock takes
A uniform thin ring, mass M= 6 kg and radius R= .35 m, with a bar of mass m= 4.5 kg across its diameter, is mounted on frictionless bearings at its center. A cord wrapped on the surface of the ring suspends a weight W= 14.7 nt. See ATTACHMENT1 for a diagram showing parameters and stating physics required.
SHM vertically moving tray with loose cube on top. Given period, find amplitude max., and given amplitude, find minimum period.
A tray is moving with SHM along a vertical y axis. A small aluminum cube is placed on the tray. a. If the period is fixed at T= 1.5 sec, find the maximum amplitude Ym for which the cube remains in contact with the tray. b. If the amplitude is fixed at Ym= .15 m, find the minimum period T for which the cube remains in contact w
For a certain point executing SHM on an x axis with amplitude .40 m, the equation giving its location as a function of time is given by: (1) x = .4 m cos (6 t) a. At time t= .35 sec, find the location, the velocity and the acceleration of the moving point. b. Find the first time after t=0 that the moving point is located a
8) The acceleration at time t, of a particle moving along the x axis is given by a(t)=20t^3+6. At time t=0 the velocity of the particle is 0 and the position of the particle is 7. What is the position of the particle at time t? 12) The function f is given by f(x)=3x^2+1. What is the average value os f over the closed inte
In Fig. 11-42, one block has a mass M = 500 g, the other has mass m = 460 g, and the pulley, which is mounted in horizontal frictionless bearings, has a radius of 5.00 cm. When released from rest, the heavier block falls 81.5 cm in 2.90 s (without the cord slipping on the pulley). (a) What is the magnitude of the block's acce
See attached file. A mass m = 3 kg on a frictionless table is attached to a hanging mass M = 5 kg by a cord through a hole in a table (see figure below). Find the speed with which m must move in a circle of radius r = 0.5 m in order for M to stay at rest. Please provide step by step solution
Please see the attachments. Use coriolis acceleration concepts and i j k vector coordinates to solve. Thanks.
Question: Pin P is attached to the collar shown; the motion of the pin is guided by a slot cut in bar BD and by the collar that slides on rod AE. Rod AE rotates with a constant angular velocity of 5 rad/s clockwise and the distance from A to P increases at a constant rate of 2 m/s. Determine at the instant shown (a) the angular
Question: A rotating cylinder about 16 km in length and 8.0 km in diameter, is designed to be used as a space colony. With what angular speed must it rotate so that the residents on it will experience the same acceleration due to gravity on Earth?
A rock is thrown upward from ground level with initial velocity Vo, beside a building whose roof height is H. In terms of Vo, H and g, find what percent of its total flight time the rock is above the roofline.
Question: Bar BDE is attached to two links AB and CD. Knowing that at the instant shown link AB rotates with a constant angular velocity of 3 rad/s clockwise, determine the acceleration (a) of point D, (b) of point E. Please refer to attachment to see a diagram of this scenario.
A 12.0-kg box rests on the flat floor of a truck. The coefficients of friction between the box and the floor are s=0.19 and k=0.15. The truck stops at a stop sign, and then begins to move with an acceleration of 2.20 m/s^2 . If the box is 1.80 m from the rear of the truck when the truck starts, (a) How much tim
Angular acceleration, tangential speed, and angle turned, in radians, by a flywheel of known diameter.
A flywheel whose diameter D= 1.2 m, is initially rotating at Wo= 200 revolutions per minute. During time t- 60 sec, its rotation rate increases with constant acceleration to a final value of Wf= 1000 rev/min. Part a. find the initial tangential speed in m/sec, of a point on the rim. Part b. find the angular acceleration in ra
I need help with the following two questions. Please view the attachments to see the questions.
Cam mechanisms are used in many machines. For example, cams open and close the valves in your car engine to admit gasoline vapor to each cylinder and to allow the escape of exhaust. The sliding wedge duplicates the function of a rotating eccentric disk on a camshaft of your car. Assume there is no friction between the wedge and
A test rocket is fired vertically from a well. A catapult boosts it to ground level, where it has a vertical velocity of 60.0 m/s. At ground level, the rocket engine fires, and the rocket accelerate upward with an acceleration of 5.00 m/s2. When the rocket is 800 m above the ground the engine fails, and the rocket goes into fr
Please see the attachment. What is the most straight forward way to solve it? Please provide explanations for the major steps. Thanks.
The position of a particle which moves along a straight line is defined by: x=t^3-6t^2-15t+40, where x is in feet and t is in seconds. Determine the time at which the velocity will be zero, the position and distance traveled at that time, and the acceleration of the particle at that time.
To protect his food from hungry bears, a boy scout raises his food pack with a rope that is thrown over a tree limb at height h above his hands. He walks away from the vertical rope with a constant velocity, vboy, holding the free end of the rope in his hands. a) Show that the speed v of the food pack is given by x(x^2+h^2)^(-1
A centrifuge is used for training astronaunts to withstand large accelerations. It consists of a chamber (in which the astronaunt sits) that is fixed to the end of a long horizontal and rigid pole. The arrangement is rotated about an axis perpendicular to the pole's free end. Such a centrifuge starts from rest and has an angular
A Ferris wheel rotates at an angular velocity of 0.24 rad/s. Starting from rest, it reaches its operating speed with an average angular acceleration of 0.030 rad/s^2. How long does it take the wheel to come up to operating speed?
In a pulley system, the time of descent of a 100 gram mass is found to be 35 seconds. The vertical distance is given as 120 cms. The radius of the pulley (in the form of a disc) is 5 cms. Mass of the pulley is unknown. Determine (a) angular acceleration of the pulley (b) number of revolutions it makes during this time (c) To
A 2500 kg car traveling to the north is slowed down uniformly from an initial velocity of 20.0 m/s by a 6250 N braking force acting opposite the car's motion. Use the impulse-momentum theorem to answer the following questions: a. What is the car's velocity after 2.50 s? b. How far does the car move during 2.50 s? c. How