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A wagon is rolling forward on level ground. Friction is negligible.The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 91 kg. The mass of the rock is0.30 kg. Initially the wagon is rolling forward at a speed of 0.52m/s. Then the person throws the rock with a speed of 15 m/s. Both speeds are relative to the ground. Find the speed of the wagon after the rock is thrown(a) directly forward in one case and (b) directly backward in another.
A mover's dolly is used to deliver a refriger- ator up a ramp into a house. What gravitational potential energy is gained by the refrigerator
Common transparent tape becomes charged when pulled from a dispenser. calculate the magnitude of the charge if electrostatic force is great enough to support the weight of a 9.00 mg piece of tape held 0.80 cm above another
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. Identify the element, using its chemical symbol
discuss and compare the principles of the carnot cycle and the brayton cycle as two different thermodynamic cycles.
A magician wishes to create the illusion of a 2.97-m-tall elephant. He plans to do this by forming a virtual image of a 38.0 cm tall model elephant with the help of a spherical mirror. How far from the mirror will the image be formed
Determine the magnitude of the force between two point charges, Q1 = -2e located at (-3.60 cm, +4.10 cm) and Q2 = -8e located at (-0.60 cm, -8.60 cm). Continue working the problem above by calculating the direction of the force that Q1 exerts on Q..
A satellite has a mass of 5839 kg and is in a circular orbit 4.10 × 105 m above the surface of a planet. The period of the orbit is 1.7 hours. The radius of the planet is 4.88 × 106 m. What would be the true weight of the satellite if it were at rest..
A galago, a very small primate, can extend its legs by about 16 cm during a jump, during which it accelerates at 140 m/s2. Which can jump higher
A simple harmonic oscillator has a potential energy of 25x2 Joules, a kinetic energy of 0.5v2 Joules where x is the displacement in meters and v the instantaneous velocity in m/s. determine the maximum instantaneous velocity
A satellite of Mars, called Phobos, has an orbital radius of 9.4 106 m and a period of 2.8 104 s. Assuming the orbit is circular, determine the mass of Mars
An iron brick measuring 200 mm / 20 cm / 0.05 m is submerged in pure water. (Hint: Use Table 4.4 from your book to find the densities) a) What is the weight of the brick? b) What is the buoyant force on the brick? c) What is the net force on the bric..
A sample of neon gas has its volume tripled and its temperature held constant. What will be the new pressure relative to the initial pressure
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