We know that dark matter must exist in galaxies. If not, many of the stars in a galaxy would ... a.Expand and go supernova due to the expansion of the Universe   b.Fly away from the galaxy because the stars’ velocities are so large, and the galaxy would not have enough gravity to hold onto them

Q: A 15.0-cm long cylinder has a moveable piston with radius 2.00 cm. (a) what is the volume of the…

A: Given data: Length of the cylinder, l=15 cm=15×10-2 m Radius of the cylinder, r=2 cm=2×10-2 m

Q: An electric heater is to heat 11 kg of oil per min. from 4.5°C to 65.5°C. The specific heat of the…

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Q: the specific volume. 4. Determine the force of gravitational attraction between the earth (m = 5.98…

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Q: . The setup shown by the diagram below was used to calculate the force experienced by a small mass m…

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Q: A 1.1 g particle has momentum 410,000 kg⋅m/s. What is the particle's speed in m/s? Express your…

A: Since the speeds are very high we use the relativistic formula for momentum,…

Q: Let's make a boat out of lead.  Specifically, 1 kg of lead.  Assuming we shape the boat like a…

A: Given data: Mass of the boat, m = 1 kg Density, ρ = 1032 kg/m^3 Our question is to find the radius…

Q: The radius of the earth is 6400 Km and the height of a person is 1.7m, how high can you stand to see…

A: Given: Radius of earth, RE=6400 km Height of person, 1.7m To Find: Height to see the Horizon

Q: (27) A 55 kg woman is seated in the passenger seat of a car traveling at a velocity of 15.0 m/s. In…

A: Given: The mass of the passenger is 55 kg. The initial velocity of the car is 15 m/s. The final…

Q: Applying a force to an object over some amount of parallel distance... (select all that apply)…

A: When we apply some force on any object then object will displayed from its initial position to some…

Q: where did the .76  come from

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Q: A 1200 kg elephant is standing on a 2.0 m diameter circular hydraulic lift platform as shown. A 70…

A: Solution: Given: m1 = mass of elephant = 1200 kgm2 = mass of man = 70 kgg = gravitational…

Q: Calculate the air temperature (in degrees Kelvin) if the speed of sound is 351.8 m/s (at standard…

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Q: A golfball is swung around in a uniform circular motion with a diameter of 3 m. If the ball makes 4…

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Q: What minimum coefficient of friction is required if there is a 60.0 km/h speed limit for a flat…

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Q: 5 02 none of the answers are correct. 01 5. How many image charges allow one to calculate the V in…

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Q: A man standing 1.50 m in front of a shaving mirror produces an inverted image 20.2 cm in front of…

A: Because they provide a larger image of the face, concave mirrors are frequently used as shaving…

Q: The moment of inertia of an object about a certain axis is 1.2 kg-m2. Initially the object is at…

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Q: what is the magnitude of the gravitational acceleration on this planet?

A: Given L=53 cm=0.53 m (Length of pendulum) 105 complete swing cycles= 132 s 1 complete swing…

Q: a. You push a couch across the floor, pushing with a force of 282.5 N horizontally. It slides…

A: GivenApplied force, F=282.5 NDistance , d=1.47 m

Q: A 15.0 kg block is released from rest at point A in the figure below. The track is frictionless…

A: Given:-  The mass of the block is m = 15 kg  The block is released from the rest. The track is…

Q: Two wires have the same resistance and radius. If the wires are made of tungsten and copper with…

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Q: A rod with a length of 3.00 m and a mass of 4.50 kg is rotating by one end (I=13ML2) about a…

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Q: This question and the previous question are based on the following information. A candle flame is 2…

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Q: If the maximum net force between two forces is 45 N and the minimum resultant is 5 N, what are the…

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Q: Calculate the speed of sound in a string that has a tension of 441 N and a linear mass density of…

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Q: If an object has 430 J of potential energy when it is 30 m off the ground, what is its potential…

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Q: A 78 kg skier moves down a mountatin on a 22 degree slope. Air drag and the wet snow provide a…

A: Given:-  The mass of the skier is m = 78 kg  The skier is moving down the mountains which have an…

Q: A 20-g ice cube floats in 150 g of water in a 100-g copper cup; all are at a temperature of 0°C. A…

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Q: Two blocks are connected by a (massless) string that runs over a (massless, frictionless) pulley as…

A: This question is based on law of motion.

Q: A point rotates about the origin in the ?? plane at a constant radius of 0.222 m with an angular…

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Q: Three identical and thin rods, each of mass 0.56 kg and length 0.90 m, are glued together to form a…

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Q: Two narrow slits separated by 1.0 mm are illuminated by 612-nm light. Y Part A Find the distance…

A: Given data: Separation between the slits, d=1 mm=1×10-3 m Wavelength of the light, λ=612…

Q: I am holding, from one end, a heavy meter stick horizontally above the ground.  The mass of the…

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Q: a www A block with mass m -6.2 kg is hung from a vertical spring. When the mass hangs in…

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Q: a. Consider two planets orbiting a distant star. Planet A is further from the star. A is orbiting at…

A: a) We use the formula T=2πRv⇒R=Tv2π=12.45·365·24·60·60 sec·14625 m/sec2π=9.13885875×1011m

Q: ction of hospital hallways, convex spherical mirror is unted high on a wall to help people avoid…

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Q: Gravitational pull must be measured in units of Height must be measured in units of Calculate the…

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Q: A beam of particles with charge –4e sent into a mass spectrometer travels undeflected through a…

A: a) Since the particle passes undeflected, the electric and magnetic fields are equal. We have…

Q: A ray of light travels from air into another medium, making an angle of 0₁ = 45.0° with the normal…

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Q: An aluminum wire having a cross-sectional area equal to 3.70 x 10-6 m² carries a current of 7.00 A.…

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Q: A laser light in air has a wavelength of 700 mm. Part B What is the frequency of this light when it…

A: Given: - The laser light in the air has a wavelength λ0= 700 nm    Find:- c) What is the frequency…

Q: 3m/s 60 kg Om/s 10 kg ? m/s 10 kg

A: Given data:  Mass of runner (m1) = 60 kg Initial velocity of runner (u1) = 3 m/s Mass of box (m2) =…

Q: As shown in the figure below, cars #1 and #2 are sliding across a horizontal frictionless surface.…

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Q: A loop of wire in the shape of a rectangle of width w and length L and a long, straight wire…

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Q: 115-W light bulb operates on an effective ac voltage of 110 V. NOTE: This is a multi-part question.…

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Q: The spaceship Intergalactica lands on the surface of the uninhabited Pink Planet, which orbits a…

A: The pendulum makes 103 cycles in 217 seconds. Hence the time T for one cycle is T=217103 seconds.

Q: 11. Find the length of a copper wire with resistance 0.0262 /ft and total resistance 5.62 Q.

A: Given  Resistance per unit length of copper wire RL = 0.0262 ohm/ft  Total resistance of copper wire…

Q: A cube 5.5 cmcm on each side is made of a metal alloy. After you drill a cylindrical hole 3.0 cmcm…

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Q: 7. a. You push a couch across the floor, pushing with a force of 282.5 N horizontally. It slides…

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Q: 27. A radar signal took 2.7 seconds to go to the moon and return. How far away was the moon at that…

A: We are given a radar signal. A radar signal is nothing but an electromagnetic wave. We know that all…

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.