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A motorboat takes passengers between two ports on a river 20 km away. The motorboat maintains the same speed relative to the river both in the upstream and the downstream trips. If the upstream trip takes 1 hour while the downstream trip takes 50 minutes, what is the speed of the river?
A car carrying a 77-kg test dummy crashed into a wall at 27m/s and is brought to rest in 0.1 s. demonstrate that the average force exerted by the seat belt on the dummy is 18,760N.
A spring with an unstrained length of 0.069 m and a spring constant of 2.7 N/m hangs vertically downward from the ceiling. A uniform electric field directed vertically upward fills the region containing the spring.
A bungee cord is stretched between two poles with a force of 447 N, What is the velocity of a wave on this bungee cord
Light moving from glass to air changes wavelength from 448.5 nm to 653.7 nm. find the frequency of the light in air
One way to measure on another planet or moon by remote sensing is to measure how long it takes an object to fall a given distance. A lander vehicle on a distant planet records the fact that it takes 3.17 for a ball to fall freely 11.26.
Suppose the horizontal velocity of the wind against a sail is 5.5 m/s parallel to its front surface and 3.3 m/s along its back surface. Calculate the approximate force on a square meter of sail in N
Its thermal conductivity is 7.50×10?2W/(m?K) ; If the temperature difference between opposite faces is 84.5?C, how much heat flows through the slab in 1 day
The maximum speed of a 2.6-kg mass attached to a spring is 0.74 m/s, and the maximum force exerted on the mass is 11 N. What is the force constant of the spring
Blue whales apparently communicate with each other using sound of frequency 17.0, What is the wavelength of such a sound in seawater
Two identical positive charges exert a repulsive force of 6.2 x10-9 N when separated by a distance of 3.6 x10-10 m. compute the charge of each.
A car with a mass of 1500 kg is traveking directly east at a slow speed of 1.20 mph and eleastically with a smaller car of mass of 1275 kg, Calculate the momenta of the cars before the collision
Suppose that a particle accelerator is used to move two beams of particles in opposite directions, what is the magnitude of the average current in this region
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