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Get college assignment help at uniessay writers A spring gun (k = 28 N/m) is used to shoot a 56-g ball horizontally. Initially the spring is compressed by 18 cm. The ball loses contact with the spring and leaves the gun when the spring is still compressed by 12 cm.What is the speed of the ball when it hits the ground, 1.4 m below the spring gun?

how much water flows over victoria falls which is 128 m high, at an average rate of 1.50 × 106 kg/s. the acceleration die to gravity is 9.81 m/s2. If half the potential energy of this water were converted into electric energy, how much power would be produced by these falls?

Light incident upon a pane of glass slows down in passing through the glass. Does it emerge at a slower speed or at its initial speed? Explain.

Jack and Jill ran up the hill at 3.2m/s. The horizontal component of Jill’s velocity vector was 2.1 m/s.what is the angle of the hill?

When two tuning forks of 132 Hz and 146 Hz, respectively, are sounded simultaneously, how many beats per second are heard? Answer in units of beats/s.

A 3.0 m long rigid beam with a mass of 120 kg is supported at each end. An 85 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam?

A space station, in the form of a wheel 125 m in diameter, rotates to provide an “artificial gravity” of 3.10 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of rotation of the wheel (in revolutions per minute) that will produce this effect.

What is the net centripetal force needed to keep the car from skidding sideways? Answer in units of N.

three uniform thin rods, each of length L = 39 cm, form an inverted U. The vertical rods each have a mass of 15 g; the horizontal rod has a mass of 32 g. What are (a) the x coordinate and (b) the y coordinate of the system’s center of mass? (Give your answer in cm)

three uniform thin rods, each of length L = 49 cm, form an inverted U. The vertical rods each have a mass of 11 g; the horizontal rod has a mass of 38 g. What are (a) the x coordinate and (b) the y coordinate of the system’s center of mass?

Get college assignment help at uniessay writers A horizontal beam of light enters a 45°-90°-45° prism at the center of its long side, as shown in Figure 26-50. The emerging ray moves in a direction that is 31° below the horizontal. What is the index of refraction of this prism?

quarterback takes the ball from the line of scrimmage, runs backward for 10 yards, and then runs sideways parallel to the line of scrimmage for11 yards. At this point, he throws a 39 yard forward pass straight down the field. What is the magnitude of the football’s resultant displacement?

A box slides down a 21° ramp with an acceleration of 1.07 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.

A loudspeaker of mass 22.0 {rm kg} is suspended a distance of h = 1.40 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 4.00 {rm m}.

A ball with a radius of 6 cm and a mass of 1850 g is thrown into a lake. Will the ball sink or float?

With what minimum speed must you toss a 130 g ball straight up to hit the 14.0 m-high roof of the gymnasium if you release the ball 1.60 m above the ground? Solve this problem using energy.

An 85-g arrow is red from a bow whose string exerts a constant force of 105 N on the arrow over a distance of 75 cm. What is the speed of the arrow as it leaves the bow?

A Texas cockroach of mass 0.159 kg runs counterclockwise around the rim of a lazy Susan (a circular disk mounted on a vertical axle) that has a radius 14.4 cm, rotational inertia 5.36 x 10-3 kg·m2, and frictionless bearings. The cockroach’s speed (relative to the ground) is 2.14 m/s, and the lazy Susan turns clockwise with angular velocity ω0 = 2.32 rad/s. The cockroach finds a bread crumb on the rim and, of course, stops. What is the angular speed of the lazy Susan after the cockroach stops?

An ob ject weighing 296 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 261 N . Immersed in oil, the ob ject appears to weigh 272 N . Find the density of the ob ject. Answer in units of kg/m 3 .

A 66.0 kg person throws a 0.0410 kg snowball forward with a ground speed of 25.0 m/s. A second person, with a mass of 60.0 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.10 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregard the friction between the skates and the ice.

#80 in Chapter 4 of the book Fundamentals of Physics, by Halliday, 9th edition. A 200-m-wide river flows due east at a uniform speed of 2.0 m/s. A boat with a speed of 8.0 m/s relative to the water leaves the south bank pointed in a direction 30 degrees west of north. What are the (a) magnitude and (b) direction of the boat’s velocity relative to the ground? (c) How long does the boat take to cross the river?

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November 3, 2019