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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
A 1500-kg car moving north at 27.0 m/s is struck by a 2165-kg car moving east at 18.0 m/s. The cars are stuck together. How fast and in what direction do they move immediately after the collision?
what is the direction of the chickens acceleration? opposite the direction of motion or along the direction of motion how far did the chicken slide in meters?
In a factory, a car is lifted by a force of 5.6kN on each tire. The car accelerates upwards at 0.5m/s^2. Determine the net force and mass of the car
A small fly of mass 0.20 g is caught in a spider's web. The web vibrates predominately with a frequency of 2.0 Hz. (a) What is the value of the effective spring stiffness constant k for the web?
A 560 g block slides along a frictionless surface at a speed of 0.35 m/s. It runs into a horizontal massless spring with spring constant 46 N/m that extends outward from a wall. It compresses the sp
A race car travels a complete lap on a circular track of radius 500 meters in 50 seconds. What is the average speed of the race car and what is the race car's average velocity?
Determine the fractional decrease in the rod's length using the formula above, where L0,Silver and L0,Gold are the initial lengths of the silver and gold rods. (See Table 12.1 for appropriate consta
a train that is 80m long begins uniform acceleration from rest toward a railway worker who is standing 150m from the track. When the front of the train passes the worker, the trains speed is 20m/s.
It compresses the spring, then is pushed back in the opposite direction by the spring, eventually losing contact with the spring. How long does the block remain in contact with the spring?
What temperature will equal number of atoms have electrons in the ground state and in the second excited state. The boltzman equation gives me a incorrect answer, how do you do this?
A cable is used to raise a 28 urn from an underwater archeological site. There is a 25 drag force from the water as the urn is raised at a constant speed.What is the tension in the cable?
A person is to be fitted with bifocals. She can see clearly when the object is between 45 cm and 1.4 m from the eye. The upper portions of the bifocals should be designed to enable her to see dista