Physics question and answers for August 27, 2023
- Q The mass of a meteor with a radius of 1 km is about 9 x 1012 kg.The mass of a meteor also is proportional to the cube of itsradius. Suppose...
- Q A mass is moving at 10 m/s in the +x direction and it collidesin a perfectly elastic collision with a mass of 2 kg moving in the-x direction. The collision...
- Q Why are there very few helium (and deuterium) nuclei a hundredthof a second after the big bang? Select all the statements that areboth correct and relevant.At this point in time...
- Q 1) A diver of mass 43.0kg stands on the end of a uniform divingboard over the water. The board is 7.00m long and has a mass of75kg. The end of...
- Q Please provide an example of a damped harmonic oscillator. Theyare more common than undamped or simple harmonic oscillators. Whatdo you think there is any harmonic motion in the physical worldthat...
- Q What is the smallest number of whole logs (density = 735 kg/m³,radius = 0.077 m, length = 2.91 m) that can be used to build a raftthat will carry 3...
- Q Two boys are sliding toward each other on a frictionless,ice-covered parking lot. Jacob, mass 45 kg, is gliding to the rightat 7.95 m/s, and Ethan, mass 31.0 kg, is gliding...
- Q A plank of length l = 2m is hinged at one end to a wall. Theother end is being (temporarily) supported by a worker who isholding it up with his...
- Q A nonconducting disk has a radius R, carries a uniform surfacecharge density s, and rotates with angular speed w.(a) Consider an annular strip that has radius ?, width ??, andcharge...
- Q A cylinder of radius 4.09 cm and a spherical shell of radius7.47 cm are rolling without slipping along the same floor. The twoobjects have the same mass. If they are...
- Q An approximately spherical, black asteroid (emissivity equal toone) of diameter 2km is orbiting the sun at a distance from the sun10 times larger than the distance from the sum to...
- Q The Moon orbits Earth in a nearly circular orbit that lasts27.32 days.1) Determine the distance from the surface of the Moon to thesurface of Earth in Mm. (Express your answer...
- Q A 4.5 kg box slides down a 4.2-m -high frictionless hill,starting from rest, across a 2.3-m -wide horizontal surface, thenhits a horizontal spring with spring constant 480 N/m . The...
- Q An 95.0 kg spacewalking astronaut pushes off a 620 kg satellite,exerting a 80.0 N force for the 0.600 s it takes him to straightenhis arms.How far apart are the astronaut...
- Q Explain the 3 Emissive flat-panel devices: electroluminescent,plasma display and field-emission display with detail to the use ofphosfur if used
- Q A clock pendulum, made of aluminum, has a period of 1.00 s s andis accurate at 8.0°C. If the clock is used in a climate where thetemperature averages 36.0°C what...
- Q In words, explain the Lawson criterion and its significance.a)One needs high densities for extended time periods to produceenough energy for fusion reactions to break even. b)One needs highdensities for short...
- Q 2. The heat capacity of one mole of aluminum at low temperature(below 50 K) follows the formCV = aT+bT3where a = 0.00135 J/K2 and b =2.48×10-5 J/K4. (The first term...
- Q Charge q = + 15 nC is uniformly distributed on aspherical shell that has a radius of 120 mm.1. What is the magnitude of the electric field just outside theshell?...
- Q why orthogonal components are useful for science?
- Q In this experiment, we have claimed to measure the speed ofsound in air. To do this, we have used an audible frequency sweep.Why can we claim that the speed of...
- Q Consider a conducting sphere of radius R carrying a net chargeQ.a). Using Gauss’s law in integral form and the equation |E| =σ/ε0 for conductors, nd the surface chargedensity on the...
- Q A woman of mass m = 58.9 kg sits on the left end of aseesaw—a plank of length L = 4.04 m, pivoted in themiddle.(a) First compute the torques on...
- Q Your little dog, Fluffy, is excited to see you and jumpsstraight up in the air to a height of 0.680 m . What is Fluffy'sinitial speed as she leaves the...
- Q Calculus dictates that(∂U/∂V) T,Ni = T(∂S/∂V)T,Ni – p = T(∂p/∂T)V,Ni – p(a) Calculate (∂U/∂V) T,N for an ideal gas [ for which p = nRT/V](b) Calculate (∂U/∂V) T,N for a...
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