Physics

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Mort's twin, Velma, flies to a distant star at high speed and returns to Mort on Earth. She then ... Started by burchfield96	1 Replies 129 Views	Jul 29, 2018 by deja
Einstein's Relativity seems to say that, if Mort and Velma are twins and Velma goes on a trip and ... Started by dalyningkenk	1 Replies 92 Views	Jul 29, 2018 by softEldritch
A certain star is 1000 light years from Earth. According to the theory of relativity, is it ... Started by lbcchick	1 Replies 86 Views	Jul 29, 2018 by yasmin
In order to quadruple an object's kinetic energy, we must A) double its speed. B) double its ... Started by chads108	3 Replies 83 Views	Jul 29, 2018 by Sarahjh
The meaning of the phrase space is relative is that A) all observers measure the same speed for a ... Started by Cooldude101	1 Replies 52 Views	Jul 29, 2018 by diesoon
One car is traveling twice as fast as a second car. How much more work can the first car do. ... Started by Charlie	1 Replies 40 Views	Jul 29, 2018 by mcarey591
To drive a typical car at 40 mph on a level road for one hour requires about 3.2 107 J of energy. ... Started by 09madisonrousseau09	1 Replies 91 Views	Jul 29, 2018 by todom5090
A 1.53-kg piece of iron is hung by a vertical ideal spring. When perturbed slightly, the system is ... Started by shofmannx20	3 Replies 83 Views	Jul 29, 2018 by coreycathey
A 1200-kg pick-up truck traveling south at 15 m/s suddenly collides with a 750-kg car that is ... Started by dollx	1 Replies 80 Views	Jul 29, 2018 by briseldagonzales
A 2.0-kg object is lifted vertically through 3.00 m by a 150-N force. How much work is done on the ... Started by jparksx	1 Replies 79 Views	Jul 29, 2018 by Perkypinki
An 825-kg space vehicle is circling Earth in a circular orbit with a radius of 10,300 km. Its orbit ... Started by LaDunn	1 Replies 183 Views	Jul 29, 2018 by kingdude89
Velma passes Mort at a high speed. Each holds a meter stick, oriented perpendicular to the direction ... Started by stock	3 Replies 242 Views	Jul 29, 2018 by rleezy04
A rock is thrown from the roof of a building, with an initial velocity of 10 m/s at an angle of 30 ... Started by vHAUNG6011	1 Replies 254 Views	Jul 29, 2018 by leeeep
A gas can containing a gallon of gasoline is stored in a basement. This gasoline contains A) both ... Started by bobbie	1 Replies 117 Views	Jul 29, 2018 by SeanoH09
How fast must a 6.0-kg cat run to have a kinetic energy of 150 J? What will be an ideal ... Started by HudsonKB16	1 Replies 36 Views	Jul 29, 2018 by Jsherida
A 5.0-kg stone is thrown upward at 7.5 m/s at an angle of 51 above the horizontal from the upper ... Started by serike	3 Replies 200 Views	Jul 29, 2018 by mjenn52
You are in a spaceship moving past Earth at nearly lightspeed and you observe Mort, who is on Earth. ... Started by DelorasTo	1 Replies 143 Views	Jul 29, 2018 by coreycathey
A certain spherical asteroid has a mass of is 4.65 1017 kg and a radius of 39,600 m. If a 150-kg ... Started by torybrooks	1 Replies 174 Views	Jul 29, 2018 by tuwy
What is the magnitude of the sum of the forces that is required to accelerate a 1200-kg car ... Started by roselinechinyere27m	1 Replies 70 Views	Jul 29, 2018 by jordangronback
A projectile is launched with an initial velocity of 80 m/s at 30 above the horizontal. Neglecting ... Started by kfurse	3 Replies 252 Views	Jul 29, 2018 by peilian
Material objects cannot be accelerated up to lightspeed because A) their length decreases toward ... Started by Tazate	1 Replies 95 Views	Jul 29, 2018 by jonathanballen97
A futuristic design for a car is to have a large flywheel within the car to store kinetic energy. ... Started by WhattoUnderstand	1 Replies 51 Views	Jul 29, 2018 by emilymalinowski12
In the past, Earth has been hit by many asteroids, some very large. Suppose one such asteroid ... Started by joe	1 Replies 75 Views	Jul 29, 2018 by Hikerman221
When a certain simple pendulum is set swinging, its angular displacement as a function of time t ... Started by cookcarl	3 Replies 105 Views	Jul 29, 2018 by missalyssa26
While spinning down from 500 rpm to rest, a flywheel does of work. This flywheel is in the shape of ... Started by itsmyluck	1 Replies 123 Views	Jul 29, 2018 by micaelaswann