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if the coefficient of friction is 0.3, find the force exerted by the man on the rope, and the work done in dragging the box over a distance of 15m.
A baseball thrown at an angle of 65.0^circ above the horizontal strikes a building 18.0 {rm m} away at a point 7.00 {rm m} above the point from which it is thrown. Ignore air resistance. Find the m
Each cable has a length of = 3.70 . What is the tension in each of the cables? Use 9.80 for the magnitude of the acceleration due to gravity.
A 85.1 kg base runner begins his slide into second base while moving at a speed of 5.9 m/s. The coefficient of kinetic friction between his clothes and the ground is 0.68. He slides so that he come
If a piece of ice weighs 44.0 {rm N} at the surface of the earth, what is its mass on the earth's surface? What is the mass of this piece of ice on the surface of Io? What is the weight of this piece
Carlie drops her ring down a well. The sound of the ring splashing at the bottom of the well is heard after 4.0seconds. Assume the speed of sound is 335m/s .How deep is the well?
Find the force (magnitude and direction) exerted on her by the bungee cord at an instant when her downward acceleration has a magnitude of 6.6 m/s2. Ignore the effects of air resistance.
A container holds 1.4 kg of water that is initially at 332 K and is converted to steam at 407 K. Assuming the volume of the system does not change, what is the change in the internal energy of the
A proton (mass= 1.67 10-27 kg, charge= 1.6 10-19 C) traveling with 1.10 106 m/s enters a region of space containing a uniform magnetic field of 1.4 T. What is the time t required for the proton to
a tuning fork produces a sound with a frequency of 249 Hz and a wavelenght in air of 1.35 m. What value does this give for the speed of sound in air? Answer in units of m/s.
A dock worker applies a constant horizontal force of 80.5 {rm N} to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves 9.00 {rm m}
A jet plane lands with a speed of 83 m/s. From the instant the plane touches the runway, what is the minimum time needed before it can come to rest?
A frog in a hemispherical bowl finds that he just floats without sinking in a fluid whose density is 1.35g/cm^3. If the bowl has a radius of 6.0 cm and negligible mass, what is the mass of the frog
A skater of mass 70.5 kg initially moves in a straight line at a speed of 4.80 m/s. The skater approaches a child of mass 41.5 kg, whom he lifts on his shoulders. Assuming there are no external hor
A 15.0 m long conveyor belt, inclined at 27.0°, is used to transport bundles of newspapers from the mail room up to the cargo bay to be loaded on delivery trucks. Each newspaper has a mass of 1
A 465 g ball swings in a vertical circle at the end of a 1.3 m-long string. When the ball is at the bottom of the circle, the tension in the string is 21 N. What is the speed of the ball at that poi
When people sleep, their metabolic rate is about 2.6*10^-4 C/(s*kg). How many calories does a 75 kg person metabolize while getting a good night's sleep of 8.5 hours?
How many litres of fuel did he deliver? the coefficient of volume epansion for diesel is 9.5*10 to the power of negative 4 degrees celcius an the coefficient of linear expansion for the steel truck
A tortoise can run with a speed of 0.13 m/s, and a hare can run 20 times as fast. In a race, they both start at the same time. What is the length of the race?
A tube of radius 5 cm is connected to tube of radius 1 cm as shown above. Water is forced through the tube at a rate of 10 liters/min. The pressure in the 5 cm tube is 1×105 Pa. The density o
A certain car battery with a 12.0 V emf has an initial charge of 170 A·h. Assuming that the potential across the terminals stays constant until the battery is completely discharged, for how l
The child is acted on by his weight, the normal force from the slide, kinetic friction, and a horizontal rope exerting a 30 Newton force. How large is the normal force of the slide on the child?
A rope applies a horizontal force of 180 N to pull a crate a distance of 2 m across the floor. A frictional force of 60 N opposes this motion.
A 77 kg person sits on a 3.5 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.7 cm in diameter. Find the pressure exerted on the floor by each leg of the chair, ass
A golf ball with an initial angle of 34? lands ex- actly 183 m down the range on a level course. The acceleration of gravity is 9.81 m/s2 . a) Neglecting air friction, what initial speed would achi