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if a football is kicked at a 30 degree angle and traveling 19 meters per second, what is the hang time of the football?
A 20.8 kg floodlight in a park is supported at the end of a horizontal beam of negligible mass that is hinged to a pole, as shown in the figure below. A cable at an angle of α=32.4° with t
A planet's moon travels in an approximately circular orbit of radius 5.0 107 m with a period of 6 h 19 min. Calculate the mass of the planet from this information.
A smooth cylinder of radius=10cm resting on a horizontal surface supports a bar AB of length 30cm which is hinged at A. The weight of the bar is 50N. The cylinder is kept from rolling away by a str
The jet is traveling at 45.0 m/s when the pilot receives the message. What is the acceleration of the plane if it takes the pilot 5.00 s to bring the plane to a halt?
Pete slides a crate up a ramp with constant speed at an angle of 30 degrees by exerting a 242 N force parallel to the ramp. How much work has been done against gravity when the crate is raised a ver
Three teams are involved in pulling a 393 kg anvil. Team A is pulling with a force of 90 N to the East. Team B is pulling with a force of 167 N to the West. Team C is pulling with a force of 122 N t
A 71 kg person escapes from a burning build- ing by jumping from a window 28 m above a catching net. The acceleration of gravity is 9.81 m/s2 . Assuming that air resistance is simply a constant 91 N
The child throws two bricks each of mass 3.0 kg in the direction opposite to the direction the wagon is to go. How fast will the wagon move if the bricks are thrown at 2.0 m/s?
An automobile gasoline tank holds 46 of gasoline. When the gasoline burns, 161 of oxygen are consumed and carbon dioxide and water are produced.What is the total combined mass of carbon dioxide and
A baseball thrown from the outfield is released from the shoulder height at an initial velocity of 29.4m/s at an initial angle of 30 degree with respect to the horizontal. What is the maximum vertic
A laser beam is directed at the top mirror from the left edge of the bottom mirror. What is the smallest angle of incidence with respect to the top mirror, such that the laser beam.
For easy viewing by all students in the class, the professor wants the distance between m=0 and m=1 maxima to be 35 cm. What slit separation is required in order to produce the desired interference
A 40.0 kg ballet dancer stands on her toes during a performance with four square inches (26.0 cm^2) in contact with the floor. What is the pressure exerted bt the floor over the area of contact in t
A 35kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 210 J from 440J.How high does she rise during this
In what direction (as an angle relative to a direct line across the river) should the swimmer aim instead, so that she arrives at the point directly opposite her starting point?
Draw the vectors starting at the black dot. The location and orientation of the vectors will be graded. The length of the vectors will not be graded.
Calculate the force and the total work required in each case. which method is easier?
A dolphin leaps out of the water at an angle of 35 ° above the horizontal. The horizontal component of the dolphin's velocity is 7.7 m/s. Find the magnitude of the vertical component of the vel
One billiard ball is shot east at 2.60 {rm m/s}. A second, identical billiard ball is shot west at 1.40 {rm m/s}. The balls have a glancing collision, not a head-on collision, deflecting the second
At 3 P.M. a car is located 20 km south of its starting point. One hour later it is 118 km farther south. After two more hours, it is 9 km south of the original starting point. What is the displaceme
A metal rod is 25.000 cm long at 25.0 degrees Celsius. When heated to 102.0 degrees Celsius, it is 25.054 cm long. What is the coefficient of linear expansion for this metal?
Its blades form a circle of diameter 0.700. What is the tangential speed of a point on the tip of the blade at time = 0.209 ?
Besides the gravitational force, a 3.90-kg object is subjected to one other constant force. The object starts from rest and in 1.20 s experiences a displacement of (4.30 - 3.30) m, where the directi
Her hands are in contact with the wall for 0.8 s. Ignoring friction and air resistance, find the magnitude and direction of the average force she exerts on the wall.