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A 140 kg horizontal beam is supported at each end. A 325 kg piano rests a fifth of the way from one end. What is the vertical force on the support closest to the piano?
The flowers of the bunchberry plant open with astonishing force and speed, causing the pollen grains to be ejected out of the flower in a mere 0.30 ms at an acceleration of 2.5×104 m/s2. With
Suppose the roller coaster in Fig. 6-38 (h1 = 40 m, h2 = 14 m, h3 = 20) passes point A with a speed of 2.00 m/s. If the average force of friction is equal to one fifth of its weight, with what speed
Why does bob continue to play the video game ever after losing $300? describe in terms of operant conditioning
A 95 kg clock initially is at rest on a horizontal floor requires a 650 N horizontal force to set it in motion. After the clock is in motion, a horizontal force of 560 N keeps it moving with a cons
The total volume of the column of water in the neck is 0.200 m^3. What is the magnitude of the force exerted by the water on the bottom of the container?
Calculate the horizontal force that must be applied to a 1-kg puck to make it accelerate on a horizontal friction-free air table with the same acceleration it would have if it were dropped and fell
An athlete executing a long jump leaves the ground at a 28° angle and travels 7.8 m. What was the take-off speed? If this speed were increased by just 5.0%, how much longer would the jump be
A charge of -6.0 nC is at the origin and a second charge of 11.0 nC is at x = 5.00 m. Find the magnitude and direction of the electric field halfway in between the two charges.
You want to measure the true potential difference (that is, the potential difference without the meter present) across the 5.00 Omega resistor using a voltmeter having an internal resistance of 10.
Determine the displacement of a plane that is uniformly accelerated from 58 m/s to 86 m/s in 12 s.
A curve with a radius of 50 m is banked at an angle of 25°. The coefficient of static friction between the tires and the roadway is 0.3. Find the correct speed of an automobile that does not require
What was the acceleration of the ball while in her hand?
What must the charge (sign and magnitude) of a particle of mass 1.47 be for it to remain stationary when placed in a downward-directed electric field of magnitude 610? Use 9.81 for the magnitude of
When the projectile is at the top of its trajectory, an internal explosion causes it to separate into two fragments of equal mass. One of the fragments falls straight downward as though it had been
For a spherical celestial object of radius R, the acceleration due to gravity g at a distance x from the center of the object is g = g0R2/x2, where g0 is the acceleration due to gravity at the objec
An electric field E=( 1.6×105 N/C, right ) causes the 5.0g ball in the figure to hang at a 20 degree angle. What is the charge on the ball?
A 49.0 kg person takes a nap in a backyard hammock. Both ropes supporting the hammock are at an angle of 21.0 above the horizontal. Find the tension in the ropes.
A stone is thrown vertically downward from a cliff 180.0-m tall. During the last half second of its flight, the stone travels a distance of 48.5 m. Find the initial speed of the stone.
A penny is placed at the outer edge of a disk radius = .150 m that rotates about an axis that is perpendicular to the plane of the disk at the center. The period of the rotation is 1.80 s. Find the
A rock of mass 33 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 242 N. What is the magnitude
A ball is tossed into the air at a speed of 64.0 m/s at an unknown angle. If the ball is observed to rise to a maximum height of 7.80 m, at what angle was the ball thrown relative to the ground?
Two tiny spheres are identical and carry charges of -30.0 uC and +60.0 uC. They are seperated by a distance of 14.0 cm. What is the magnitude and direction of the electric field at a point midway b
An earth satellite moves in a circular orbit with and orbital speed of 6200m/s. Find the time of one revolution of the satellite?
An elevator starts from rest with a constant upward acceleration and moves 1 m in the first 1.8 s. A passenger in the elevator is holding a 6.1 kg bundle at the end of a vertical cord. The accelera