Answer:
Explanation:
A light year is a unit of length and is defined as "the distance a photon would travel in vacuum during a Julian year at the speed of light at an infinite distance from any gravitational field or magnetic field. "
In other words: It is the distance that the light travels in a year.
This unit is equivalent to , which mathematically is expressed as:
Doing the conversion:
This is the distance from Earth to Sirius in miles.
Answer:
18.15 m/s
Explanation:
Radius of the loop, R = 23 m.
Weight of the rider, w= 760 N.
Mass of the rider, m = w/g = 77.5 kg
Apparent weight at the top of the loop is 350 N.
At the top:
Momentum in x-axis before collision: 4.5 x 1.5 = 6.75
Momentum in x-axis after collision: 1.5 x 2.1 x cos(30) + 3.2 x v x cos(30)
By the principle of conservation of momentum, these are equal:
6.75 = 2.73 + 2.77v
v = 1.45 m/s
Answer:
F = - K X force exerted by compressed spring
F X = 1/2 M V^2 energy (work) required to produce a speed V for mass M
K X * X = 1/2 M V^2 direction of F is the same as that of V
X^2 = M V^2 / K combining terms
X = (M / K)^1/2 V
X = (.92 / 130)^1/2 * 1.4 = .118 m