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A 165 g cube of ice at 0°C is dropped into 2.1 kg of water that was originally at 78°C. What is the final temperature of the water after the ice has melted?
The block pulls the dielectric from the capacitor as it falls. Compute the speed of the block at the instant the dielectric leaves the capacitor assuming it starts at rest and that the voltage acros
A 13 kg table initially at rest on a horizontal floor requires a 148 N horizontal force to set it in motion. Once the table is in motion, a 98 N horizontal force keeps it moving at a constant veloc
A 68 {rm kg} skier is on flat snow waiting in line for a ski lift. While goofing around, he bends forward stiffly, as shown in the figure. To hold this position, tension in his back muscles must sup
a 700.0N window washer is standing on a uniform scaffold supported by a vertical rope at each end. The scaffold weighs 200.0N and is 3.00m long. what is the force in each rope when the washer stands
a 0.11 kg cube of ice at 0.0C is added to 0.450 kg of soup at 80 C. Assuming that the soup has the same specific capacity as water,find the final temperature of the soup after the ice has melted. (
An apple is dropped from a 25.0m cliff. At the same time, a person at the bottom of the cliff fries an arrow up towards the apple. The arrow stricks the apple 0.450 seconds later. a) What was the ac
a 0.1 uF parallel plate capacitor is connected to a 12 v battery. a dielectric slab (k=4) is inserted to fill the space between the plates. find the additional charge that flows to the plates.
A 9.0 bullet is fired into a 8.0 wood block that is at rest on a wood table. The block, with the bullet embedded, slides 5.0 across the table. The coefficient of kinetic friction for wood sliding o
What is the ?nal equilibrium temperature when 5 g of milk at 28 ?C is added to 162 g of co?ee at 86?C? Assume the speci?c heats of milk and co?ee are the same as that of water,and neglect the speci?
Determine the magnitude of the force that each sphere now experiences, and state whether the force is attractive or repulsive.
A 400g lemming waddles horizontally off a small 4.9m high cliff with a speed of 0.5ms-1. How far from the base of the cliff will the lemming land? What will be the lemming's speed upon landing?
The three ropes in the figure are tied to a small, very light ring.Two of these ropes are anchored to walls at right angles with tensions T1 = 35 N andT2 = 70 N. What are the magnitude and direction
An electric dipole is formed from +- 3.0 nC point charges spaced 2.0 mm apart. The dipole is centered at the origin, oriented along the y-axis. What is the electric field strength at point (x,y) = (
Sketch a graph showing the height of this canon ball over time if it was fired at 30°, 45° and 60° above the horizontal.
A block is projected up a frictionless inclined plane with initial speed v0 = 9.04 m/s. The angle of incline is θ = 49.0°. (a) How far up the plane does it go? (b) How long does it take to
A 65kg boy and his 40kg sister, both wearing roller blades face each other at rest. How much chemical energy is converted into mechanical energy in the girl's muscles?
A 33 g ball is fired horizontally with initial speed v_0 toward a 110 g ball that is hanging motionless from a 1.1 m-long string. The balls undergo a head-on, perfectly elastic collision, after whic
A speeder passes a parked police car at a constant speed of 29.5 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.45 m/s2. How much time passes before the speed
A potential difference of 250V, the ion enters a magnetic field of 0.500 T, in a direction perpendicular to the field. Calculate the radius of the path of the ion in the field.
A mass of 377 g connected to a light spring of force constant 13.2 N/m oscillates on a horizontal, frictionless track. The amplitude of the motion is 5.9 cm. Calculate the total energy of the syste
An asteroid, whose mass is 2.0 10-4 times the mass of Earth, revolves in a circular orbit around the Sun at a distance that is 2.9 times Earth's distance from the Sun.
Compare the magnitudes of the pushing forces and the acceleration that they experience. Which of the following are true; The father experiences greater pushing force.
A projectile is launched straight up at 141 m/s. How fast is it moving at the top of its trajectory? Suppose it is launched upward at 45 degrees above the horizontal plane. How fast is it moving at
Now suppose that there is energy dissipation of 0.01 J per cycle of the spring-mass system. What is the average power input in watts required to maintain a steady oscillation?