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The height of a certain waterfall is 33.1 m. When the water reaches the bottom of the falls, its speed is 25.8 m/s. Neglecting air resistance, what is the speed of the water at the top of the falls
In a container filled with gas at a constant temperature, the volume is 183 mL and the pressure is at 310 mm Hg. The desired new volume is 90.0 mL. What is the required new pressure?
A capacitor is formed by placing a 20cm long charge carrier charged to +10nC placed 5cm away from and parallel to a 20cm long charge carrier charged to -10nC. Find the electric field at 1cm, 2cm, 3c
A 60-kg person drops from rest a distance of 1.20 m to a platform of negligible mass supported by a stiff spring. The platform drops 6 cm before the person comes to rest. What is the spring constant
A 1820 kg car is traveling with a speed of 15.0 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 42.5 m?
A box slides down a 30.5° ramp with an acceleration of 1.33 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.
A 100 W lightbulb produces 4.0 W of visible light. What is the light intensity on a wall 3.0 m away from the lightbulb?
Define the width of a bright fringe as the distance between the minima on either side. (a) What is the width of the central bright fringe?
When the watermelon reaches the peak of its flight, what is (a) its velocity, (b) its acceleration, (c) the elapsed time, and (d) its height above the ground?
The laws of refraction and reflection are the same for sound and for light. The speed of sound is 340 m/s in air and 1510 m/s in water. If a sound wave that is traveling in air approaches a flat wat
A 230 kg crate is pushed horizontally with a force of 730 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.
An hour later the same ship is 22 km southeast. If the ship moved at constant speed and always in the same direction, what was its velocity during this time?
If a star with a mass equal to that of the sun (of mass 1.99 × 10^30 kg) were to collapse into neutrons, what would be the radius of the star? Answer in units of m.
The acceleration free-fall on the moon is 1/6 of its value on earth. Suppose he hit the ball with a speed of 22 at an angle 26 above the horizontal. How much farther would it travel on the moon tha
Two equal charges Q are positioned at points (x=l, y=0) and (x=-l, y=0). Determine the electric field as a function of y for points along the y axis. Show that the field is a maximum at y= + or - l
If the projectile rises to a maximum height of only 14.7 m, determine the magnitude of the average force due to air resistance.
What molecule of the calvin cycle is most like molecules found in glycolysis
A 17 g rifle bullet traveling 220 m/s buries itself in a 3.9 kg pendulum hanging on a 3.0 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal compon
A dry cell does 7.40 J of work through chemical energy to transfer 3.80 C between the terminals of the cell. What is the electric potential between the two terminals?
A motorist drives north for 39.0 minutes at 88.5 km/h and then stops for 15.0 minutes. He then continues north, traveling 130 km in 1.80 h. What is his total displacement?
The cannonball is fired at a speed of 52 m/s and at an angle of 28°. A second cannonball that was accidentally dropped hits the moat below in 1.6 s. How tall is the top of the castle wall?
Prepare a presentation on the trickster. Identify a figure from contemporary popular culture that is not explicitly drawn from mythology
Jack and Jill are on two different floors of their high rise office building and looking out of their respective windows. Jack sees a flower pot go past his window ledge and Jill sees the same pot g
A 19kg child sits in a swing supported by two chains each 3m long. If tension in each chain at the lowest point is 140N find the childs speed at the lowest point.
Determine (a) how long it takes the first rock to hit the ground and (b) at what velocity it hits. Determine (c) how long it takes the second rock to hit the ground.