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A crate (140 kg) is in an elevator traveling upward and slowing down at 6 m/s2. Find the normal force exerted on the crate by the elevator. Assume g = 10 m/s2.
Two 450N blocks are connected by a light, flexible cord passing over a frictionless pulley. If the coefficient of friction under the blocks is 0.15. Find the tension in the cord.
A small ball of mass 51 g is suspended from a string of length 89 cm and whirled in a circle lying in the horizontal plane. If the string makes an angle of 31degrees with the vertical, ?nd the cent
A balloon with a radius of 14cm and an electric charge of 3.75x10^-9 C is brought within the electric field of the larger balloon so their centres are 40.0cm apart. Determine the magnitude of the e
A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2. What is its angular speed at the instant it goes through an angular displacement of 4.2 rad?
How high above the ground is the highest point that the skateboarder reaches? When the skateboarder reaches the highest point, how far is this point horizontally from the end of the ramp?
A generator uses a coil that has 80 turns and a 0.60-T magnetic field. The frequency of this generator is 60.0 Hz, and its emf has an rms value of 120 V. Assuming that each turn of the coil is a sq
A boy throws a 1.5 kg rock upward. To do so the boy applies a constant 38.5 N force upwards on the rock from point a to point b. then the rock continues upward to it's maximum height at point c.What
We have been assigned to create a bottle rocket out of whatever materials we want except glass and metal. Our bottle is 2 liters and we are allowed to put water in the bottle when we launch if we de
Suppose the coefficient of friction between the road and the tires on a car is 0.60. What speed will put the car on the very of sliding as it rounds a level curve of 30.5 m radius?
A copper-bottomed kettle, its bottom 24cm in diameter and 3.0mm thick, sits on a burner. the kettle holds boiling water, and energy flows into the water from the kettle bottom at 800 watts. what is
Describe the events that occur as water molecules start in hot bath water and end up on the surface of the bathroom mirror.
What is the physiological basis for delayed-onset muscle soreness?
A race car has a mass of 701 kg. It starts from rest and travels 36.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
The water exerts a force of 160 N east. If the boat (including its crew) has a mass of 330 kg, what are the magnitude and direction of its acceleration?
Two hollow metal spheres are concentric with each other. The inner sphere has a radius of 0.1500 m and a potential of 85.0 V. The radius of the outer sphere is 0.1520 m and its potential is 82.0 V.
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?
The argument of a trigonomertric function muse be a dimnesionless quantity.if the speed v of a particle of mass m as a function of time t is given by v=ωA sin(k/m)^1/2
A 790-N cliff diver in Alcapulco drops from a cliff 20.6 m above the water's surface. If friction is disregarded, what is the cliff diver's speed just before striking the water?
A cart is pushed up a ramp with an initial speed vo = 2.5 m/s. If theta is increased to 45degree, what is the maximum distance d that the cart will travel up the ramp?
A wave in the ocean has amplitude of 3 m. Winds pick up suddenly, increasing the wave's amplitude to 6 m. How does this change in amplitude affect the wave's frequency and the amount of energy it t
A 5.50 current runs through a 12-gauge copper wire (diameter 2.05 ) and through a light bulb. Copper has free electrons per cubic meter. How many electrons pass through the light bulb each second?
Prove the 3-dB advantage of homodyne detection by showing that the average electrical power generated by a coherent receiver is twice as large for homodyne detection as for heterodyne detection und
A 1300 kg car carrying four 91 kg people travels over a "washboard" dirt road with corrugations 3.9 m apart. The car bounces with maximum amplitude when its speed is 16 km/h. When the car stops, an
The spring is compressed against the floor a distance of 2.00 cm, and the toy is reeased .If the toy has a mass of 100g and reses to a maximum height of 60.0cm. estimate the force constant of the sp