Answer:
5.1 m/s
Explanation:
The figure is missing: find it in attachment.
In order to find the average speed, we have to calculate the length of the total path, and divide it by the total time elapsed.
The curve from A to B is a quarter of a circle with a radius of r = 20 m, so its length is:
The path BC is the hypothenuse of a right triangle with sides equal to 20 m and 30 m, so its length is
Finally, the length of the path AC is the sum of the side of 30 m and the radius of the curve, so
So the total distance covered is
The total time elapsed is
So, the average speed is
White dwarfs
<u>Explanation:</u>
Hertzsprung-Russel graph is a 2-dimensional graph, plotting star’s luminosity against temperature they emit.
White dwarfs are the star exhibiting high temperatures and low luminosities. These stars are extremely dense and mass comparable to that of the sun.
The main cause of low luminosities in the absence of fusion reaction inside the core of the star. Faint luminosity is provided by the thermal energy of the star. They are considered to be in the final stage of evolution having masses in the range of 10 solar mass (hence not enough to form a star)
Vector is perpendicular to x axis or i component.
Hence i component is 0
j component is 63.5
Answer:
u = 13.67 m/s
Explanation:
given,
window height = 2 m
window is 7.5 m off the ground on its path up
total distance from the ground to pass the window = 2 + 7.5 = 9.5 m
time taken to go past the window = 1.30 s
using equation of motion
u = 13.67 m/s
hence, the initial velocity of the ball is equal to 13.67 m/s
Answer:
require a medium to propagate
Explanation:
this is because electromagnetic waves can travel through vacuum at the speed of 3.0 x 10^8 m/s
because they don't need particles to transfer energy
hope this helps
