a) How long does it take a beam of light, such as a radio signal, to travel from an Earth laboratory to a spacecraft on Mars, a distance of about 35,000,000 miles (56,000,000 km)? b) Express the distance from an Earth laboratory to a spacecraft on Mars, a distance of about 35,000,000 miles (56,000,000 km) in light-year.
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
Please solve this question
![1. a) How long does it take a beam of light, such as a radio signal, to travel from an Earth
laboratory to a spacecraft on Mars, a distance of about 35,000,000 miles (56,000,000
km)?
b) Express the distance from an Earth laboratory to a spacecraft on Mars, a distance of
about 35,000,000 miles (56,000,000 km) in light-year.
[Astronomers measure large distances in a unit called the light-year. This is the distance
that light traveling at approximately 186,000 milsec will travel in 1 yr.]
2. Workout the tension forces:
30
60 -
T1 = ?
3. a) The resultant R of two vectors A
and B has half the magnitude of A
and is perpendicular to B. If the
magnitude of A is 5, what is the
magnitude of B and the angle
T2 = ?
10 Kg
between A and B?
b) Find the vector AxB if A = i -3j +
2k and B = - 21 - j + 3k.
W = mg
4. A person standing on the edge of a
high cliff throws a rock straight up
with an initial velocity of 13.0 m/s. The rock misses the edge of the cliff as it falls back to
earth. Calculate the position and velocity of the rock 1.00 s, 2.00 s, and 3.00 s after it is
thrown, neglecting the effects of air resistance.
5. A car moving at 25 m/sec strikes a tree, and the tree is seen to dent the front by 0.5 m.
Assume that the deceleration of the car was constant. Find the deceleration and time it
took the car to stop.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9ff1f5a8-a242-4330-96e7-60dff3869faa%2F10befa29-27c1-4595-8b67-339770005604%2Fua2zvzh_processed.jpeg&w=3840&q=75)
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