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What will be the equilibrium temperature when a 227 block of copper at 265 is placed in a 155 aluminum calorimeter cup containing 844 of water at 14.5?
In a local bar, a customer slides an empty beer mug down the counter for a refill. With what speed did the mug leave the counter?
A scaffold of mass 78 kg and length 5.3 m is supported in a horizontal position by a vertical cable at each end. A window washer of mass 86 kg stands at a point 1.1 m from one end. What is the tens
What is the new velocity (magnitude and direction) of the airplane with respect to the ground? Specify your direction as a number of degrees counterclockwise from due East.
The security alarm on a parked car goes off and produces a frequency of 967 Hz. The speed of sound is 343 m/s. As you drive toward this parked car, pass it, and drive away, you observe the frequenc
The volume control on a stereo amplifier is adjusted so the sound intensity level increases from 23 to 63 dB. What is the ratio of the final sound intensity to the original sound intensity?
The charge and the mass of an alpha particle are = 3.20×10^-19 C and = 6.68×10^-27 kg , respectively. What is the value of the change in potential energy of the alpha particle?
A 4.2 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 2.4 m/s2, find the force exerted by the rope on the bucket.
A man strikes a long aluminum rod at one end. Another man, at the other end with his ear close to the rod, hears the sound of the blow twice (once through the air and once through the rod), with a 2
The scale of a spring balance reading from 0 to 175 has a length of 15.0 . A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.70 .Ignoring the mass of the spring
Calculate the force of gravity between a newborn baby (mass = 3 kg) and the planet Mars (mass = 6.4 1023 kg), when Mars is at its position closest to Earth (distance = 8.0 1010 m).
They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 65.0 kg and is 4.10 m from the pivot. He is skating at a speed of
What is the electric potential energy of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.)
It is 167 cm from your eyes to your toes. You're standing 220 cm in front of a tall mirror. How far is it from your eyes to the image of your toes?
Which can jump to a height of 12.4 ft when leaving the ground at an angle of 37°. With what speed, in SI units, must the animal leave the ground to reach that height?
A projectile is shot from the edge of a cliff h = 285 m above ground level with an initial speed of v0 = 115 m/s. Determine the time taken by the projectile to hit point P at ground level.
What will be the equilibrium temperature when a 259 block of copper at 258 is placed in a 137 aluminum calorimeter cup containing 836 of water at 16.0?
A 35-kg crate rests on a horizontal floor, and a 73-kg person is standing on the crate. (a) Determine the magnitude of the normal force that the floor exerts on the crate.
a rocket weight 4.36 x 10 ^4 n has an engine that provides an upward force of 8.90 x 10 ^5 n. it reaches a maximum speed of 860 m/s. how long must the engine burn in order to reach this speed?
The power delivered to the light bulb is 23.1 W. What is the resistance of the light bulb? There are two possible answers. Give the larger of the two.
A 10.1-g bullet is fired into a stationary block of wood having mass m = 4.96 kg. The bullet imbeds into the block. The speed of the bullet-plus-wood combination immediately after the collision is
A uniform electric field exists in a region between two oppositely charged plates. What is the speed of the electron as it strikes the second plate? (b) What is the magnitude of the electric field?
Bike is supported equally by the two tires. If the gauge pressure in each tire is 7.60 x 105 Pa, what is the area of contact between each tire and the ground?
Nearby, a beam of protons is traveling steadily at 400 m/s at 36.9 degrees north of up. Throughout this region there is a uniform magnetic field while all other forces are negligible; determine that
What mass (in grams) of steam at 100°C must be mixed with 141 g of ice at its melting point, in a thermally insulated container.