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What is the lift force exerted by the air on the rotors? What is the tension in the cable (ignore its mass) that connects the car to the helicopter?
A race car has a mass of 705 kg. It starts from rest and travels 41.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
Estimate the electric field at a point 2.40 cm perpendicular to the midpoint of a uniformly charged 2.00 m-long thin wire carrying a total charge of 4.60x10^-6
The acceleration of gravity is 9.8 m/s2 . If the object's speed reaches one-half its terminal speed in 3.048 s, determine the terminal speed.
Find the value of (theta) for which the reflection on the vertical surface of the paperweight exactly satisfies the condition for total internal reflection.
A tapered, pressurized tank for a rocket contains 0.250 m3 of kerosene, which has a mass of 205 kg. The pressure at the top of the kerosene is 2.01 x 105 Pa. The pressure force of 18.0 kN on the ta
It will be traveling with speed 197 m/s. We have a large and powerful spring whose stiffness is 2.5x10^5 N/m. How much must we compress the spring?
Two skaters that are initially at rest push off from one another. One has a mass of 50 kg and moves with a speed of 4.0 m/s to the right after pushing off. What is the velocity of the other skater w
The A string of a violin is 32 cm long between fixed points with a fundamental frequency of 440 Hz and a mass per unit length of 6.5×10-4 kg/m. What are the wave speed in the string?
Because of the cramped space under the hood, you'll need to pull at an angle of 115^circ with respect to the wrench shaft. With what force must you pull?
A 65 kg swimmer jumps off a 10 m tower. The swimmer comes to a strop 2.0 m below the surface. What is the net force exerted by the water
Assuming that all of the fuel is used, find the final speed of the last portion of the ejected fuel relative to a stationary observer. Please provide step-by-step method.
What are the magnitude and direction of the impulse of the net force applied to the ball during the collision with the floor?
A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each have a mass of 4.7 × 10-26 kg, and each strikes the umbrella (without rebounding) with a speed
A 65.5 kg circus performer slides 4.15 m down a pole to the circus floor, starting from rest. (b) What is her kinetic energy when the frictional force has a magnitude of 520 N?
The disk has a mass of 200 kg and a radius of 2.0 m. A 42- kg child rides at the center of the merry-go-round while a playmate sets it turning at 0.10rpm. How fast will the disk be turning (in rpm)?
A stone S of mass 8 kg is attached to the other end of the rope. S is held at a point 6m vertically below A and then released. Find the initial acceleration of S.
A 18.6 kg piece of zinc at 75 degrees Celsius is placed in a container of water. The water has a mass of 20 kg and has a temperature of 10.1 degrees Celsius before the zinc is added. What is the fi
A toy car X of mass .200 kg moves along a frictionless surface with a velocity of .180 m/s. It collides with another toy car Y, with a mass .250 kg and a speed of .130 in the same direction. After
A disk, initially rotating at 149 rad/s, is slowed down with a constant angular acceleration of magnitude 4.23 rad/s2. (a) How much time does the disk take to stop? (b) Through what angle (rad) does
A 63 kg student traveling in a car with a constant velocity has a kinetic energy of 1.15e4 J. What is the speedometer reading of the car in km/h?
A force acting on a body in empty space increases at a constant rate from zero. The body has a mass of 10 kg, and after 4 seconds the force is 50 N. What is the speed of the object at 4 seconds?
If the backpack begins to slide when the spring ( = 130 ) stretches by 2.40 , what is the coefficient of static friction between the backpack and the table?
Point charges of +1.00 X 10-9C, +1.00 X 10-9 C, and -2.00 X 10-9, are placed at the vertices of an equilateral triangle. Find the magnitude of the electric field at the center of the triangle, whic
With the suspension point fixed.The mass is pulled away a distance 20cm beyond the equilibrium position 0 and released. Find The differential equation and initial conditions describing the motion.