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a 4700 kg helicopter accelerates upward at 2.95 m/s2. the acceleration of gravity is 9.8 m/s2. what lift force is exerted by the air on the propellers?
If the probe is to achieve a maximum distance of 8.0 multiplied by 106 m from the center of Zero, with what initial kinetic energy must it be launched from the surface of Zero?
Two speakers, one directly behind the other, are each generating a 152-Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a li
While in this first excited state, the electron receives 3.022 eV of energy. What is the quantum number n that describes the energy level that the electron ends up at?
An object of mass is traveling on a horizontal surface. There is a coefficient of kinetic friction between the object and the surface. The object has speed when it reaches and encounters a spring.
Two 10 cm diameter charged disks face each other, 20 cm apart. The left disk is charged to - 50 nC and the right disk is charged to + 50 nC .
In the Atwood machine shown below, m1 = 2.00 kg and m2 = 7.95 kg. The masses of the pulley and string are negligible by comparison. The pulley turns without friction and the string does not stretch
A 230 , 21.0-cm-diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 0 to 1500 rpm in 5.00?
On a screen which is a distance of 1.90 away, the separation between dark fringes is 4.04. What is the separation of the slits?
A person exerts a horizontal force of F = 160 N in the test apparatus shown in the drawing. (h = 0.35 m.) Find the horizontal force M that his flexor muscle exerts on his forearm.
A weight lifter lifts a set of weights a vertical distance of 2.00 m. If a constant net force of 350 N is exerted on the weights, what is the net work done on the weights?
An alpha particle (a helium nucleus) is traveling along the positive x-axis at 1300 m/s when it enters a cylindrical tube of radius 0.700 cm centered on the x-axis. Inside the tube is a uniform elec
A heavy ball with a weight of 110 N is hung from the ceiling of a lecture hall on a 4.5-{rm m}-long rope. The ball is pulled to one side and released to swing as a pendulum, reaching a speed of 5.8
An 69.0 N box of clothes is pulled 8.9 m up a 30.0° ramp by a force of 100 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate t
A .31 kg iron horseshoe that is initially at 763 *C is dropped into a bucket containing 20 kg of water at 21 *C. What is the final equilibrium temperature? Neglect any energy transfer to or from the
The bar is held by a cord that makes a 90? angle with respect to bar and 50 ? with respect to wall. What is the magnitude of the horizontal force Hx on the pivot? The acceleration of gravity is 9.8
Determine, according to quantum mechanics, (a) the total energy (in eV) of the atom, (b) the magnitude of the maximum angular momentum the electron can have in this state.
A 3.20 kg block is in equilibrium on an incline of 24.8?. The acceleration of gravity is 9.81 m/s2 . What is Fn of the incline on the block?
A toy plane is flying in a horizontal circle by being attached to a 0.78-meter string. The plane has a mass of 117.7 grams and makes five circular revolutions in 3.5 seconds. Find the tension force
A canoe has a velocity of 0.350 southeast relative to the earth. The canoe is on a river that is flowing at 0.510 east relative to the earth. Find the magnitude of the velocity of the canoe relative
A 1180-kg car is being driven up a 6.89 ° hill. The frictional force is directed opposite to the motion of the car and has a magnitude of 484 N.
The arm of a crane at a construction site is 14.4 m long, and it makes an angle of 40° with the horizontal. Assume that the maximum load the crane can handle is limited by the amount of torque t
A rock of mass 48 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 258 N. What is the magnitude
What minimum distance are they from each other? The angle may be too large to use small angle approximation. Answer in units of m.
The heat of fusion of water is 80 cal/g. When 25 g of ice at 0oC is placed in the contents of a 12oz can of Coke(=350g) at 25oC, what is the final temperature of the beverage?