Physics question and answers for September 17, 2023
- Q An object is 15.2 cm to the left of a lens with a focal lengthof 10.2 cm. A second lens of focal length 11.8 cm is 39.27 cm tothe right...
- Q Strontium 38Sr90 has a half-life of 29.1 yr. It is chemicallysimilar to calcium, enters the body through the food chain, andcollects in the bones. Consequently, 38Sr90 is a particularlyserious health...
- Q (a) Stations A and B are at the same sea surface elevation leveland have a bottom depth of 2000 m. Both stations have seawater witha uniform density with respect to...
- Q A 25kg block is placed 2.7m above the ground on a frictionlessramp. At the bottom of a ramp there is an ideal spring.A. If the block is let go, how...
- Q A projectile is fixed at an upward angle of 38.0 degrees fromthe top of a 105m high cliff speed of 165m/s. What is it’s speedwhen it strikes the ground? Please...
- Q Aprojectile is fired at an upward angle of 380 degrees from the topof a 105-m-high cliff with a speed of 165m/s. What is its speedwhen it strikes the ground below...
- Q Why doesn't great mass automatically equal great inertia?
- Q Describe how a DC motor works. Be sure to list the parts anddescribe the function for each.
- Q A bungee cord is 30.0 m long and, when stretched a distance x,it exerts a restoring force of magnitude kx. Your father-in-law(mass 93.0 kg ) stands on a platform 45.0...
- Q Two of the three electrons in a lithium atom have quantumnumbers of n = 1, l = 0, ml = 0, ms = +1/2 and n = 1, l =...
- Q A hydrogen atom is in the ground state. It absorbs energy andmakes a transition to the n = 5 excited state. The atom returns tothe ground state by emitting two...
- Q Using a minimum of 250 words, discuss Kepler's laws of planetarymotion. How do these laws apply when precisely placing sattelitesinto orbit? Explain how these calculations are made using sampleequations.Please answer...
- Q An electron is in the ground state of an infinite square well.The energy of the ground state is E1 = 1.35eV.(a) What wavelength of electromagnetic radiation would be neededto excite...
- Q We assumed that the spring is ideal. In reality, as you stretchand compress the spring, frictional forces of the spring come intoplay. Explain how the frictional forces of the spring...
- Q -A roller coaster cart of mass (m1=127 kg) initially sits atrest on a track. Once the motor is activated, the cart isaccelerated forward (across level ground) until it reaches thebottom...
- Q The 11 g head of a bobble-head doll oscillates in SHM at afrequency of 5.0 Hz .What is the spring constant of the spring on which the head ismounted?Suppose the...
- Q -A smug little kitten pounces about on the top of a skyscraper.In his excessive confidence, he slips and tumbles over the edge.Don't worry...he manages to cling to a pipe that...
- Q Two Earth satellites, A and B, each of massm, are to be launched into circular orbits about Earth'scenter. Satellite A is to orbit at an altitude of 6660 km.Satellite B...
- Q A 3.0 g latex balloon is filled with 2.8 g of helium. Whenfilled, the balloon is a 32-cm-diameter sphere. When released, theballoon accelerates upward until it reaches a terminal speed....
- Q The Venus-Sun distance is 108 million kilometers, and theEarth-Sun distance is 150 million kilometers. Suppose an imaginaryline from Venus to the Sun forms a right angle with an imaginaryline from...
- Q A 60.0 kg person running at an initial speed of 4.50 m/s jumpsonto a 120 kg cart that is initially at rest. The person slides onthe cart's top surface and...
- Q 1) what is a diffraction grating2) why do we use \"discharge tube\" to perform the experimentinstead of a light bulb3)If \"d \" is the grating constant (spacing in between two...
- Q Discuss the motion of a cannonball shot at an angle in the sky.Is there an optimal angle that would increase the range of thecannonball shot?
- Q In a nuclear reactor, in the fission process, neutrons areemitted at high energies. Neutrons are to be thermalized, i.e.,their kinetic energies have to be significantly reduced, so thatyou can increase...
- Q To transfer a fix amount of electrical energy while keepingOhmic heating low, it is good to increase voltage？
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