Answer: As you pointed out, the Sun takes about 226 million years to orbit the center of our Galaxy, and it orbits at a speed of about 230 km/s. The distance from the Sun to the center of our Galaxy, though, is about 8 kilo-parsecs (kpc), which accounts for the factor-of-two overestimate in your orbital period calculation.

Tip 1: Always install Operating System updates The most important steps for any computer user is to always install updates, especially security updates, when they become available for your.

It goes 20 km upstream and 55 2 km downstream in 13 2 hours. What is the speed (in km/hr) of stream ? a) 3 b) 5 c) 8 d) 11 Question 4: A boat travels 60 kilometers downstream and 20 kilometers upstream in 4 hours. The same boat travels 40 kilometers downstream and 40 kilometers upstream in 6 hours. What is the speed (in km/hr) of the stream? a) 24

Fishes respire with the help of gills. Gills are richly supplied with blood capillaries and can readily absorb oxygen dissolved in water. Since fishes cannot absorb gaseous oxygen they die soon after they are taken out of the water.

Since the first Olympic Games were held in Athens in 1896, a whole host of sports and events have been discontinued from the programme. The first Olympic tournament took place from 6 to 15 April.

A. 200 sec B. 190 sec C. 210 sec D. 150 sec. Explanation: Time taken by B run 1000 meters = (1000 * 10)/50 = 200 sec. Time taken by A = 200 – 10 = 190 sec.

EXERCISE 5.1 1. In which of the following situations, does the list of numbers involved make an arithmetic progression, and why? (i) The taxi fare after each km when the fare is ₹15 for the first km and ₹8 for each additional km. (ii) The amount of air present in a cylinder when a vacuum pump removes 4 1 of the air remaining in the cylinder at a time.

A train covered a certain distance at a uniform speed. If the train had been 5 kmph faster, it would have taken 3 hours less than the scheduled time. And, if the train were slower by 4 kmph, it would have taken 3 hours more than the scheduled time. Find the length of the journey.

A straight highway leads to the foot of a tower. A man standing at the top of the tower observes a car at an angle of depression of 30^o , which is approaching the foot of the tower with a uniform speed. Six seconds later, the angle of depression of the car is found to be 60^o .

In reality, the Sun is dragging us around the galaxy at around 800,000km/h, taking around 250 million years to complete a single orbit. That means our Solar System has made around 18 complete circuits since it was formed around 4.5 billion years ago.

Answer: The two steps that the government has taken to conserve plants and animals are :- Constructing national parks, wildlife sanctuaries, biosphere reserves to protect our natural vegetation and wildlife. An international convention CITES has been established that lists several species of animals and birds in which trade is prohibited.

(TTY 888-720-7489) Wear a mask in indoor public places. Vaccines will protect you from severe illness and death. After you are fully vaccinated, wear a mask in indoor public places. You can still be infected and transmit the virus to others. If you are not vaccinated, get your vaccine, and wear a mask in indoor public places.