The distance of earth from sun is 150 million km
We know that one million = 10^6 and 1 km= 10^3 m
Hence 150 million km = 150× 10^6 ×10^3 metre=150×10^9 m
=1.5×10^11 m
The speed of light in vacuum is 2.999... m/s which can be approximately close to 3.0 ×10^8 m/s
We are asked to calculate the time taken by the light beam to reach from sun to earth.
we know that average velocity 
⇒ 
Here distance=1.5×10^11 m and v=c= 3.0×10^8 m/s
hence time ![[t]=\frac{1.5*10^{11} }{3.0*10^{8} } second](https://tex.z-dn.net/?f=%5Bt%5D%3D%5Cfrac%7B1.5%2A10%5E%7B11%7D%20%7D%7B3.0%2A10%5E%7B8%7D%20%7D%20second)
=0.5×10^3 s
=5.0×10^2 s
A correct scientific notation is written as m×10^n [Here m is the magnitude and n is power of 10]
Hence the value of m =5 and value of n =2
A horizontal force is applied to an object making it run with a constant velocity across a surface.
Mass is a property of an object. It doesn't change, no matter where the object is.
Weight is the gravitational force between two objects. It depends on the masses
of both objects, and also on the distance between their centers, so it changes,
depending on the mass of the OTHER object involved, and on the distance
between them.
Answer:
speed of the bicycle = 2.81 m/s
Explanation:
given data
tuning fork rated f = 488 Hz
beat frequency fb = 8 Hz
speed of sound vs = 343 m/s
solution
we get here frequency that rider is listening that is
rider hearing frequency = 488 Hz + 8 Hz
rider hearing frequency = 496 Hz
and when it bouncing from sheer wall at frequency of related to stationary object
frequency = 488 Hz + 4 Hz
frequency = 492 Hz
so now we get speed of the bicycle that is
speed of the bicycle = (
× 343 ) - 343 Hz
speed of the bicycle = 2.81 m/s
Answer:
The force must increase
Explanation:
According to newton's second law "force is the product of mass and acceleration".
Force = mass x acceleration
Now, the mass of the sports car is lesser compared to that of the truck. Therefore, to take both automobiles to the same speed, enough force must be applied by the engine of the truck.
There must be an increase in the force in order to make both automobiles attain the same speed.