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the observed frequency of the siren is 490 Hz. Assuming the speed of sound in air is 343 m/s, determine the ambulance's speed (in m/s) from these observations.
What average force must be applied to a 0.45 kg ball traveling horizontally at 30.8 m/s to bring the ball to rest in 0.25 seconds?
What is the kinetic energy of the spinning block after the string unwinds? Use energy methods
A 240 {rm kg} weather rocket is loaded with 100 {rm kg} of fuel and fired straight up. What is the rocket's maximum altitude?
Two bicycle tires are set rolling with the same initial speed of 4.0 m/s along a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is infl
A uniform rod is attached to a wall by a hinge at its base. The rod has a mass of 8.0 kg, a length of 1.3 m, is at an angle of 17° above the horizontal, and is held in place by a horizontal cor
An unmarked police car, traveling a constant 91 km/h, is passed by a speeder traveling 153 km/h. Precisely 0.80 s after the speeder passes, the policeman steps on the accelerator. If the police car
The coefficient of kinetic friction between the tires and the road is 0.720 . What is the speed of the automobile after 1.30 s have elapsed?
The same roller-coaster cart rides through each dip at a different speed. For the different values given for the radius of curvature and speed , rank the magnitude of the force of the roller-coaster
A wire of initial length L0 and radius r0 has a measured resistance of 3.0 . The wire is drawn under tensile stress to a new uniform radius of r = 0.45r0. What is the new resistance of the wire?
A 14 g rifle bullet traveling 200 m/s buries itself in a 3.5 kg pendulum hanging on a 3.3 m long string, which makes the pendulum swing upward in an arc. Determine the horizontal component of the p
A 600 ball is attached to the spring and allowed to come to rest. It is then pulled down 6.90 and released. What is the time constant if the ball's amplitude has decreased to 3.20 after 30.0 oscillati
Consider a point P on the x axis, the axis of the ring. (a) Does the potential at P vary as the distribution of charge on the ring varies? Why or why not? (b) Does the electric field at P vary as th
A 10.0-kg mass is placed on a 25.0o degree incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.580, and the coefficient of sliding friction is 0.520. Th
What is the electric potential at this point including the units and if 25 nC charge were placed at this point, what would double its energy be?
A point charge q1 = -8.9 μC is located at the center of a thick conducting shell of inner radius a = 2.2 cm and outer radius b = 4.5 cm, The conducting shell has a net charge of q2 = 1.1 μC. W
Three identical point charges Q are placed at the vertices of an equilateral triangle (length of each side = 2.0m.) If Q = 60 uC, what is the magnitude of the electrostatic force on any one of the
A uniform spherical shell of mass 8.10kg with diameter 48.0cm has four small masses of mass 1.80kg attached to its outer surface and equally spaced around it.
Subsequently oscillate back and forth with an angular frequency of 14.1 rad/s. What is the speed of the object at the instant when the spring is stretched by 0.035 m relative to its unstrained lengt
An airplane P is heading N 80o W at 250 m/s relative to the air. The wind blows from N 10o E with the speed of 40 m/s relative to the ground. Find the magnitude and direction of the velocity of air
A curve in a highway has a radius of 110m. At what angle should the road be banked so that a car traveling at 26.6m/s has no tendency to skid sideways on the road?
A maximum speed is 4.75 m/sec, and it accelerates from rest and then back to rest at 1.21 m/s2. (a) How long does it take to make the nonstop 171 m run, starting and ending at rest?
Can anyone please help me to solve this numerical: A 40,000-kg freight car is coasting at a speed of 5.0 m/s along a straight track when it strikes a 30,000-kg stationary freight car and coup
Area of 22.0Ai.initially the spring is at rest length. How many kilograms of sand must be slowly poured into the container to press the spring by 7.00 cm.
A horizontal uniform bar of mass 2.6 kg and length 3.0 m is hung horizontally on two vertical strings. String 1 is attached to the end of the bar, and string 2 is attached a distance 0.7 m from the