Our year would now be 2.8 times longer, we would also be receiving only 1/4 of the energy from the sun that we currently do. This means that we’d now be out beyond the orbit of Mars and right at the edge of the asteroid belt, and things would rapidly get very cold with temperatures expected to drop by around 50 degrees Celsius on average, and that’s with our current atmospheric composition which would not be stable in the new conditions. And also, any living thing on earth would die.
What
is the maximum distance the train can travel if it accelerates from
rest until it reaches its cruising speed and then runs at that speed for
15 minutes?
d = vo*t + 0.5*a*(t**2) ..........................(vo= initial speed = 0; a= acceleration; t=time, d = distance)
Vf = vo + a*t (final speed, in this case it will be the cruising speed)
Since vo = 0 (starts from rest)
t = Vf/a
d = 0 + 0.5*a*((Vf/a)**2)
d = (0.5/a)*(Vf)**2
a = 24545 miles/h2 = 10ft/s2
d1 = (0.5/24545 miles/h2)*(120 mi/h)**2 = 0.293 miles
From cruising speed, distance traveled after 15 minutes (0.25h)
v = d/t ...................> d2 =v*t = <span>120 mi/h (0.25h)</span> = 30 miles
Maximum distance the train can travel,
D = d1 + d2 = 0.293 + 30 miles = 30.293 miles
An experimental group is the group in the experiment that receives the variable that is being tested. Only one variable is tested at a time. The control group does not receive the test variable. the experimental groups are used to find the answers in a experiment
Answer:
Time of race = 10.18 s
Explanation:
She keeps this acceleration for 17 m and then maintains the velocity for the remainder of the 100-m dash
Time to travel 17 m can be calculated
s = ut + 0.5at²
17 = 0 x t + 0.5 x 3.89 x t²
t = 2.96 s
Velocity after 2.96 seconds
v = 3.89 x 2.96 = 11.50 m/s
Remaining distance = 100 - 17 = 83 m
Time required to cover 83 m with a speed of 11.50 m/s
Time of race = 2.96 + 7.22 = 10.18 s
If the Sun disappeared suddenly, we wouldn't know about it for about 8 minutes ... that's how long it takes for heat and light from the Sun to get here to Earth.
8 minutes after the Sun disappeared, the sky would turn totally black. All plants would immediately stop growing ... including all the plants that people or animals eat to live.
Then, after a few more minutes, we would start to notice that it was beginning to slowly get cooler, and that would continue until Earth was too cold for anything to live on it.
