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Q. In coming to a stop, a car leaves skid marks 87.0 m long on the highway. Assuming a deceleration of 6.90 m/s2, estimate the speed of the car just before braking.
Q. A brick is thrown vertically upward with an initial speed of 3.10 m/s from the roof of a building. If the building is 74.0 m tall, how much time passes before the brick lands on the ground?
Four identical masses of mass 710 kg each are placed at the corners of a square whose side lengths are 15.0 cm. What is the magnitude of net gravitational force on one of the masses, due to the other three.
An airplane moves 140 m/s as it travels around the vertical circular loop which has a 1 km radius. What is the magnitude of the resultant force on the 70 kg pilot of this plane at the bottom of this loop.
In a die-casting operation 0.1 kg charges of molten zinc alloy at 410 degrees C are injected at a rate of 120 charges per hour. Calculate the average die temperature after a die-casting operation
An 11.90 V battery is connected to a series circuit containing a 6ohm resistor and a 2.30 H inductor. The circuit is established and current is 1.9833 A. How long will it take the current to reach 50 percent of its final value? Answer in units of s
What are the velocities of the two people after the snowball is exchanged. What is the greatest kinetic energy of the electrons removed from the cathode by this light.
A 56.0 kg ice skater spins about a vertical axis by her body with her arms horizontally outstretched, making 1.50 turns each second. The distance from one hand to the other is 1.5 m . Biometric measurements indicate that each hand typically makes ..
A superhero flies 287 meters from the top of a tall building at an angle of 17 degrees below the horizontal. What is the vertical component of the superhero's displacement? Answer in units of meters. The horizontal is 274.459 meters and the vertical ..
A weight (with a mass of 90 kg) is suspended from the point near the right-hand end of a uniform boom with a mass of 71kg. To support the uniform boom a cable runs from this same point to a wall (the left-hand vertical coordinate) and by a pivot on t..
A 75-m long train begins unknown uniform acceleration from rest.The front of the train has a speed of 23 m/s when it passes arailway worker who is standing 180m from where the front of the train started. What will the speed of the last car be as i..
For a certain change, the value of ëU is -2.37 kJ. During the change, system absorbs 650 joules. How much work did the system do.
A parachutist with a camera, both descending at a velocity of 12 m/s, releases that camera at an altitude of 120 m.
A coffee filter of mass 1.2 grams dropped from a height of 3 m reaches the ground with a speed of 0.7 m/s. How much kinetic energy Kair did air molecules gain from the falling coffee filter.
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