Physics

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In a ballistics test, a 28-g bullet pierces a sand bag that is 30cm thick. If the initial bullet ... Started by rosent76	1 Replies 727 Views	Jul 29, 2018 by nmyers
A particular lightbulb produces 8 J of thermal energy while producing 2 J of radiant energy, and ... Started by ereecah	3 Replies 173 Views	Jul 29, 2018 by GCabra
To what form or forms of energy does the relationship E = mc2 apply? A) only kinetic energy and ... Started by joe	1 Replies 59 Views	Jul 29, 2018 by blakcmamba
In a laboratory experiment, a student brings up the rotational speed of a flywheel to 30.0 rpm. She ... Started by oliviahorn72	1 Replies 150 Views	Jul 29, 2018 by bd5255
Which of the following energy transformations represents the operation of a wind turbine a device ... Started by krzymel	1 Replies 121 Views	Jul 29, 2018 by peilian
What feature of Einstein's theory of relativity is demonstrated by the phenomenon of ... Started by jake	3 Replies 45 Views	Jul 29, 2018 by shailee
A plane has an airspeed of 142 m/s. A 16 m/s wind is blowing southward at the same time as the plane ... Started by tatyanajohnson	1 Replies 89 Views	Jul 29, 2018 by ansleighelindsey
A 1.53-kg bucket hangs on a rope wrapped around a pulley of mass 7.07 kg and radius 66 cm. This ... Started by kshipps	1 Replies 448 Views	Jul 29, 2018 by aliotak
An automobile travels at an unchanging speed of 80 km/hr on a straight level road. Which of the ... Started by cdr_15	1 Replies 113 Views	Jul 29, 2018 by flannelavenger
A 375-g stone hangs from a thin light string that is wrapped around the circumference of a ... Started by asan beg	3 Replies 191 Views	Jul 29, 2018 by softEldritch
What is the main energy transformation (input and useful output) for a person speeding up while ... Started by sjones	1 Replies 166 Views	Jul 29, 2018 by alexisweber49
A torque of 12 N m is exerted on a solid, uniform disk of radius 0.50 m. If the disk accelerates at ... Started by @Brianna17	1 Replies 171 Views	Jul 29, 2018 by juliaf
What does E = mc2 say--that all energy has mass, or that all mass has energy? A) All mass has ... Started by nelaaney	1 Replies 222 Views	Jul 29, 2018 by polinasid
In which of the following processes does the system's total mass change? A) An automobile speeds ... Started by fahad	3 Replies 174 Views	Jul 29, 2018 by Anton
A boat, whose speed in still water is 8.0 m/s, crosses a river with a current of 6.0 m/s. If the ... Started by RYAN BANYAN	1 Replies 122 Views	Jul 29, 2018 by meow1234
Are the laws of energy conservation of energy, and 2nd law of thermodynamics known for certain to be ... Started by sam.t96	1 Replies 310 Views	Jul 29, 2018 by emilymalinowski12
A plane flies directly from city A to city B, which are separated by 2300 mi. From A to B, the plane ... Started by lbcchick	1 Replies 134 Views	Jul 29, 2018 by LVPMS
The main energy transformation that occurs while an electric blender is mixing your orange juice is ... Started by penguins	3 Replies 188 Views	Jul 29, 2018 by dpost18
You lift a 1 kg object weight on Earth = 10 N by 1 m. By about how much does the object's mass ... Started by joesmith1212	1 Replies 141 Views	Jul 29, 2018 by iman
A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and ... Started by sarasara	1 Replies 118 Views	Jul 29, 2018 by mk6555
Which of these energy transformations best describes the overall operation of a hydroelectric power ... Started by Collmarie	1 Replies 203 Views	Jul 29, 2018 by janeli
If the work done to stretch an ideal spring by 4.0 cm is 6.0 J, what is the spring constant (force ... Started by saraeharris	3 Replies 159 Views	Jul 29, 2018 by chevyboi1976
What is the wave speed in a brass wire with a radius of 0.500 mm stretched with a tension of 125 N? ... Started by ereecah	1 Replies 109 Views	Jul 29, 2018 by Galvarado142
According to Einstein's theory of relativity, how much energy is contained in the material of a one ... Started by cookcarl	1 Replies 38 Views	Jul 29, 2018 by memslove
A horizontal 52-N force must be exerted for a box to slide across a flat surface at a constant ... Started by mikaylakyoung	1 Replies 57 Views	Jul 29, 2018 by hugthug12