It is possible to derive the age of the universe given the value of the Hubble constant and the distance to a galaxy, again with the assumption that the value of the Hubble constant has not changed since the Big Bang. Consider a galaxy at a distance of 235 million light-years receding from us at a velocity, v. If the Hubble constant is 20.5 km/s per million light-years, what is its velocity? (Enter the magnitude in km/

Q: Choose the correct answer. Briefly explain and show your solution. Thank you.

A: We should note the following few points before answering the above question. Electric field inside a…

Q: A jetliner goes from rest to a takeoff speed of 182 mi/h in 31.4 s. What is the magnitude of its…

A:

Q: A bullet of mass 50g moving with an initial velocity of 100m/s, strikes a wooden block and comes to…

A:

Q: 11. You take a ride in a wagon. The wagon’s mass (including you) is 200 kg. A horse pulls it with a…

A: Total mass, m=200 kg Pulling force by the horse, F= 78.9 N Speed of the mass, v=3.7 m/s Displacement…

Q: A cold metal bar at -30 degrees celicus is submerged in a pool maintained at a temperature of 70…

A: in this question we use newton's equation of cooling.

Q: cheetah can accelerate from rest to 23.5 m/s in 2.00 s. Assume that the acceleration is constant…

A:

Q: A metallic wire of uniform cross-section and resistance R is bent into a circle of radius a. The…

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Q: A person pushes a 16.0 kg lawn mower at constant speed with a force of 84.0 N directed along the…

A: Mass of the lawn mower, m=16 kg Force applied, FAPP=84 N Angle with the horizontal, θ=45°

Q: What is the rotational kinetic energy of a 2.00kg wheel that has a radius of 0.350m when rotating at…

A: Correct Answer: Option (A) i.e. 885 J

Q: A 3m long weightless beam is supported at each end by cables. A painter weighing 900N stands 1m from…

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Q: A mFe = 0.16 kg mass of iron is heated to 100∘C and then placed in a Styrofoam cup containing mw =…

A:

Q: 3. Figure 2.2 is a photograph of an eyeball with the image of a boy in a doorway. Is the eye here…

A: The eye her act as  Convex mirror.  If it was acting as a lens, then the object would have to be…

Q: A beaker of water contains 175 mL of water starting at 27.4 °C. What will the temperature be if 39.3…

A: Given data: Mass (m) = 175 ml = 175 g Initial temperature (T0) = 27.4 °C Heat absorbed (Q) = 39.3 kJ…

Q: the period of a moving rock in a horizonal circle with a radio of 2m is 1.00s. find its tangential…

A: In the given question, Radius of the circle (r) = 2m The time period of circular motion (T) = 1s We…

Q: At a football tryout, a player runs a 40-yard dash in t₂ = 4.85 seconds. If the reaches his maximum…

A: Total distance covered by the player, L1+L2=40 yard Total time taken, t1+t2=4.85 s The distance,…

Q: A 14.0 kg bucket is lowered vertically by a rope in which there is 168 N of tension at a given…

A:

Q: A puck with mass mA = 2.42 [g] moves eastward with speed VA = 1.73 [m/s]. It then collides with…

A: mass of puck A = 2.42 g initial velocity of A = 1.73 m/s due east mass of puck B = 1.25 g initial…

Q: A simple pendulum is formed of a rope of length L = 1.6 m and a bob of mass m. When the pendulum…

A: Length of the rope,l=1.6 m Angle=10⁰ Speed of the bob = 2 m/s

Q: determine the centripetal acceleration of a moving car at a velocity of 40.0 km/h in a curve of…

A: Given  Velocity of the car is v=40.0km/h=40.0×10003600m/s=11.1 m/s Radius of the curve is r=20.0 m…

Q: An object of mass mm is launched from a planet of mass M and radius R.  Calculate this minimum…

A: Write the given data. M=5.38×1023 kgR=83.2×103 km=83.2×106 m

Q: Two thin disk-shaped wheels of radii RA = 40 cm and RB = 60 cm are attached to each other on an axle…

A: Torque is given by:- T= R×F = RFsin(θ) Where θ= angle between R and F Clockwise torque is taken as…

Q: NO 4. End A of the bar AB in Fig. P11.53 rests on a fric- tionless horizontal surface, and end B is…

A: Given:-  We have given a figure as the end of bar AB is in rest on a frictionless horizontal…

Q: What is the efficiency of a pulley system, which lifts a 1,000 kg load a distance of 2 m by the…

A: in this question we determine  answer by simple efficiency equation.

Q: You take a ride in a wagon. The wagon’s mass (including you) is 200 kg. A horse pulls it with a…

A:

Q: A 72-kg boy and a 48- kg girl, both wearing ice skates face each other at rest on a skating rink.…

A:

Q: A 58.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 128…

A: Given:-  The mass of the projectile  is m= 58 kg  The angle at which the projectile fired is θ= 30°…

Q: How much heat is required to melt 3.00 kg of Ice at an initial temperature of 0 degC, and turn it…

A: Given : mass, m = 3 kg  Initial temperature = 0 ℃  Final steam temperature = 100 ℃  Find : Heat…

Q: calculate the centripedal force of a vehicle of 2000kg that rotates a curve of 175m radio at a speed…

A:

Q: 1. 0.065 kg object is attached to a spring is a spring constant of Joo N/m. The Other end of the…

A: Given:- m= 0.065 kg K= 100 N/m

Q: A large charge QQ exists at the center of a cube. It is surrounded by six smaller charges, qq, each…

A:

Q: A hat will happen to the ammeter reading when switch S is closed? 2002 he reading will decrease as…

A:

Q: cheetah can accelerate from rest to 23.5 m/s in 2.00 s. Assume that the acceleration is constant…

A: Given: The initial speed of the cheetah is 0 m/s. The final speed of the cheetah is 23.5 m/s. The…

Q: 7. Charlie has a graduated cylinder, water, and an irregularly-shaped object. He pours some water…

A:

Q: The body of a stone-age man was found in a glacier in 1997. The body was dated using radiocarbon…

A: Given   Half period , t(1/2) = 5840 years  Initial activity , Ro = 0.25 Bq  Final activity , R =…

Q: In what resistor will the smallest current pass through? * ○ the 60 ohm resistor O the 20 ohm…

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Q: What average force is required to stop a 1600 kg car in 9.0 s if the car is traveling at 80 km/h?…

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Q: What is the final temperature of a drink if the initial 0.600 kg of water is at a temperature of…

A:

Q: A mass m = 1.4 kg hangs at the end of a vertical spring whose top end is fixed to the ceiling. The…

A:

Q: Calculate the force

A: Given data, mass of a body,m= 300 gIt is initially at rest is acted upon by a force which causes it…

Q: direction parallel to the hill and the y direction perpendicular to the hill and redraw the FBD. The…

A: A child pull on sled up on a small hill

Q: The velocity of a particle which moves along the s-axis is given by v=8+10+// where t is in seconds…

A:

Q: A merry go round at a playground can be modeled as a solid disk of mass 40 kg. While it rotates 20…

A:

Q: 2. A body second which buches velocity. When has velocity of which body 25 moving both kte and…

A:

Q: A rocket fired vertically up from the north pole achieves a velocity of 28 000 km/h at an altitude…

A:

Q: A 4.8 kg block slides at 2.63m/s on a horizontal, frictionless surface and collides with a 2.7 kg…

A:

Q: To measure the total current that pass through the circuit, where must the ammeter be placed? * O 10…

A: We placed ammeter in such a position that total current passed through it. In this case total…

Q: A 0.75-kg block oscillates on the end of a spring with a spring constant of 100 N/m. The oscillation…

A: Frequency of oscillations is proportional to spring constant and inversely to mass. A restoring…

Q: If an object were placed a distance of 10 cm from the convex lens (on the right hand side of the…

A:

Q: What is the vrms of hydrogen on the surface of the sun if its temperature is 5.36E3 degC? What is…

A:

Q: Two metal spheres, one of radius R and the other of radius 2R, both have same surface charge density…

A: Total charge on sphere 1: Q1=σ(4πR2)Q1=4πR2σ Similarly, total charge on sphere 2:…

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.