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Lillian (mass 42.0 kg) standing on slippery ice catches her leaping dog (mass 15 kg) moving horizontally at 2.0 m/s. What is the speed of Lilian and her dog after the catch?
The amplitude of the motion is .093 m. What is the magnitude of the velocity of the mass when the displacement is equal to .0199 m?
A bullet is fired from ground level with a speed of 150 m/s at an angle of 30 degrees above the horizontal. What is the velocity of the bullet when it is at the highest point of its trajectory?
A 3.50-m-long, 400 steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 75.0 construction worker stands at the far end of
The coefficient of static friction between his hands and the book is 0.34. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?
A small object with a mass of 430 mg carries a charge of 40.0 nC and is suspended by a thread between the vertical plates of a parallel-plate capacitor. The plates are separated by 5.00 cm. If the
A pipe open at one end only has a fundamental frequency of 286 Hz. A second pipe, initially identical to the first pipe, is shortened by cutting off a portion of the open end. Now, when both pipes v
The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.53 m and 1.03 m, respectively. The respective rotational speeds are 449 rev/min and 4147 rev/min. Calculate the spe
Two students are on a balcony 20.0 m above the street. One student throws a ball (ball 1) vertically downward at 12.7 m/s; at the same instant, the other student throws a ball (ball 2) vertically up
A 1.25-kg ball begins rolling from rest with constant angular acceleration down a hill. If it takes 3.60 s for it to make the first complete revolution, how long will it take to?
Two large, parallel, conducting plates are 9.1 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of 4.2 x 10-15 N acts on an electron p
(Assume a smooth transition at the bottom of the incline.) If the collision is elastic, and friction can be ignored. Determine the speeds of the two blocks after the collision.
An airplane flies horizontally with speed 1000km/h(280m/s) an engine falls it takes 30s to gets to the ground. neglect air resistance show the airplane is 4.5km high?
A small, 100g cart is moving at 1.2 m/s on an air track when it collides with a larger, 1.00kg cart at rest. After the collision, the small cart recoils at .850 m/s. what is the speed of the large c
If this position is to remain correct to one-half the width of a finger (that is, to within 0.600 cm.), what is the maximum allowable percentage change in the string tension?
A simple harmonic oscillator consists of a block of mass 4.10 kg attached to a spring of spring constant 300 N/m. When t = 0.820 s, the position and velocity of the block are x = 0.188 m and v = 3.6
A small object with a mass of 380 mg carries a charge of 40.0 nC and is suspended by a thread between the vertical plates of a parallel-plate capacitor. The plates are separated by 4.00 cm. If the
Suppose an electric field with a magnitude of 2.8 E 4 N/C at a certain location, points due south. If a charge of -4.0 E -6 C is brought to the location, what is the electrostatic force that acts on
How high does the top of the ice block float above the water level?
To measure the weight of the cat, a person places a 100N box and a 60N box from the ends of a uniform pole that is pivoted at its center. The system balances when the cat stands at a point 1/4 of t
Assuming that the helium behaves like an ideal gas, (a) what is the total translational kinetic energy of the molecules of the gas? (b) what is the average kinetic energy per molecule?
The 7.0 N frictional force is applied at a point 40 cm from the chair's rotation axis, in the direction that dauses the greatest angular acceleration. If that angular acceleration is 1.8 rad/s^2, wh
When a guitar string is sounded along with a 412-Hz tuning fork, a beat frequency of 43.0 Hz is heard. When the same string is sounded along with a 422-Hz tuning fork, the beat frequency is 33.0 Hz
An 9.00 point mass and a 12.5 point mass are held in place 50.0 apart. A particle of mass is released from a point between the two masses 19.0 from the 9.00 mass along the line connecting the two fi
A jeweler working with a heated 47 g gold ring must lower the ring's temperature to make it safe to handle. If the ring is initially at 99 degrees Celcius, what mass of water at 25 degrees Celcuis i