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After the police car passes, the observed frequency of the siren is 455 Hz. Determine the car's speed from these observations.
A pinball spring with a k value of 79.2 N/m is compressd a distance of 3.5 cm. If it launches a pinball at a speed of 1.2 m/s, what is the mass of the pinball?
The anchor line is 40 meters long. Assuming the river has a uniform depth, how deep is the river directly below the boat?
If the ring is initally at 99 celsius, what mass of water at 25 celsius is needed to lower the ring's temperature to 38 celsius.
A sled reaches the foot of a hill at a speed of 6.7 m/s. If the coefficient of kinetic friction between the sled and ground is 0.192, the distance the sled travels before coming to a stop is ____ m
Calculate the the numerical value for the acceleration (Assume g = 9.81 m/s2).
Mr. Kaufman worries that his wife's interactions with the baby may eventually lead the child to (a) cry easily when frustrated, (b) fearfully cling to his mother, (c) become unfriendly toward other
Assuming that the ball's initial velocity was 45 above the horizontal, and ignoring air resistance, what did the initial speed of the ball need to be to produce such a home run if the ball was hit a
A 340-kg sailboat has an acceleration of 0.76 m/s2 at an angle of 63° north of east. Find the magnitude and direction of the net force that acts on the sailboat.
What distance does the car cover in the last 2.0 seconds of its motion? What is the constant speed that characterizes the middle portion of its motion?
Find the time taken for the casting to slide down the plane a distance of 10 m without any external force being applied. Find also, the force required to give the casting an acceleration of 2 m/s2 u
Roger sees water balloons fall past his window. He notices that each balloon strikes the sidewalk 1.1 s after passing his window. Roger's room is on the fifth floor, 25 m above the sidewalk. Assumi
How many revolutions does the baseball make on its way to home plate? For simplicity, assume that the 60 ft path is a straight line.
The fundamental frequency of the standing waves in the portion of the string above the rod is f. Find the mass of the portion of the string above the rod.
At the same time, a stationary trumpeter played the same note. Ballot heard 4 beats/s. How fast was the train moving toward him? The speed of sound in air is 343 m/s .
What frequency is heard by a stationary observer when the engine moves toward him at 25.0m/s is the temperature outside is 40 degrees Celsius, speed of sound 355m/s?
A loudspeaker of mass 22.0 kg is suspended a distance of h = 2.20 m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.10 m. What is the tensi
An exponential distribution with a mean time of thirty minutes. Over the long run, approximately what percentage of machines, on average, will be operating?
What is the terminal speed for an 77.0 skier going down a 45.0 snow-covered slope on wooden skis = 0.060? Assume that the skier is 1.70 tall and 0.500 wide
Two horizontal forces, 249 N and 165 N, are exerted in opposite directions on a crate. What is the net horizontal force on the crate? Be sure to indicate the direction of the net force. (Assume tha
A pendulum of length 5.0 m is held out to point A (see diagram below). At the vertical position, an overhang effectively cuts the length of the pendulum by an amount equal to 4.0 m.
The distance between the first and fifth minimum on a screen 60 cm behind the slits is 6.0 mm. What is the wavelength of the light used in this experiment?
Megan's mass is 30 kg. She climbs the 4.8 m ladder of a slide and reaches a velocity of 2.8 m/s at the bottom of the slide. How much work was done by friction on Megan? Assume that air resistance i
A hollow spherical shell has mass 8.15 kg and radius 0.220 m. It is initially at rest and then rotates about a stationary axis that lies along a diameter with a constant acceleration of 0.880 rad/s
Find the acceleration of the elevator(magnitude and direction). (b) What is the acceleration if the scale reads 670N? (c) if the scale reads zero, should the student worry?