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A 60 kg person escapes from a burning building by jumping from a window 20 m above a catching net. Assuming that air resistance exerts a 95 N force on the person during the fall, determine the pers
The specific heat of water is 4.2/gc if you wish to heat 300 grams ofwater from 30 to 100c how much heat will be required ?
The magnification produced by the lens is 1/3. calculate the distance through which the object should be moved to decrease the magnification to 1/4?
A 112-turn coil has a radius of 3.96 cm and a resistance of 27.3 W. The coil is in a uniform magnetic field that is perpendicular to the plane of the coil. What rate of change of the magnetic field
An athlete executing a long jump leaves the ground at a 30° 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 baseball leaves a pitcher's hand horizontally at a speed of 141 km/h. The distance to the batter is 18.3 m.(Ignore the effect of air resistance.) (a) How long does the ball take to travel the firs
A car with bad shock absorbers bounces up and down with a period of 0.736 s after hitting a bump. The car has a mass of 1340 kg and is supported by four springs of equal force constant k. Determine
What is the stopping distance of the car, as measured from the point where the driver first notices the red light?
A ball rolls horizontally off the edge of a tabletop that is 0.78 m high. It strikes the floor 2.80 m away from the edge of the table. What is the initial (horizontal) velocity of the ball?
A harmonic wave travels in a wire with amplitude 5.69 mm, wavelength 1.03 m, and frequency 438 Hz. What is the speed with which the wave travels?
A block rests on a ?at plate that executes vertical simple harmonic motion with a period of 1.35 s. What is the maximum amplitude of the motion for which the block does not separat
A speedboat starts from rest and accelerates at +2.01 m/s2 for 7.40 s. At the end of this time, the boat continues for an additional 5.90 s with an acceleration of +0.518 m/s2. Following this, the b
A 18.0 kg gold bar at 27.0°C is placed in a large, insulated 0.800 kg glass container at 15.0°C with 2.00 kg of water at 25.0°C. Calculate the final equilibrium temperature.
A 15 g rifle bullet traveling 190 m/s buries itself in a 3.8 kg pendulum hanging on a 3.0 m long string, which makes the pendulum swing upward in an arc. Determine the horizontal component of the p
A constant torque of 23.5 N·m is applied to a grindstone whose moment of inertia is 0.130 kg·m2. Using energy principles, and neglecting friction, find the angular speed after the grin
This is accomplished using two small rockets, each with 130 thrust, that are mounted on the rim of the station. How long will it take to reach the desired spin rate?
A car is traveling 17.0 m/s when the driver sees a child standing on the road. She takes .80 s to react, then steps on the brakes and slows at 6.5 m/s squared. How far does the car go before it stop
A 93-{rm kg} water skier floating in a lake is pulled from rest to a speed of 12 m/s in a distance of 26 m. What is the net force exerted on the skier, assuming his acceleration is constant?
On cm extends above the water level. If you shaved off the 1 cm part, how many centimeters of the remaining ice would extend above water level?
In the deep ocean, a water wave with wavelength 95 {rm m} travels at 12 {rm m}/{rm s}. Suppose a small boat is at the crest of this wave, 1.5 {rm m} above the equilibrium position. What will the ver
Find the electric potential at the empty corner of the three charges are held in place in the figure below, where length x = 0.15 m and height y = 0.10 m
A car is designed to get its energy from a rotating flywheel with a radius of 2.0 m and a mass of 600 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's ro
Certain neutron stars (extremely dense stars) a believed to be rotating at about 1 rev/s. If such a star has a radius of 16 km, what must be its minimum mass so that material on its surface remains
You decide to make a circular pen, because if you wish to enclose an area using a given length of fencing, then a circular fence encloses a larger area than a fence of any other shape. What is the r
A cannonball launched with an initial velocity of 151 m/s at an angle of 50° follows a parabolic path and hits a balloon at the top of its trajectory. Neglecting air resistance, how fast is it