Answer:
Einstein's 1915 general theory of relativity holds that what we perceive as the force of gravity arises from the curvature of space and time. The scientist proposed that objects such as the sun and the Earth change this geometry.
Explanation:
Answer: velocity = 79.6m/s, distance covered = 139.6m and velocity when distance is 10.0m = 61.611m/s
Explanation:
First step is to take a direction of motion, so to avoid issues with negative sign, I take my direction of motion as the positive y axis which makes the parameters positive.
The object is of a free fall thus it has a constant acceleration of g = 9.8m/s².
a) initial velocity (u) = 60m/s, g = 9.8m/s², time taken (t) =2s, we need to get velocity at that time using the formulae below
v = u + at
v = 60 + (9.8)* 2
v = 60 + 19.6
v = 79.6m/s
b) to get the distance traveled at t =2s, we use the formulae below
s =ut + 1/2at² where s = distance covered.
s = 60 * 2 + 1/2 * 9.8 * 2²
s = 120 + 1/2 *9.8 * 4
s = 120 + 9.8 * 2
s = 120 + 19.6
s = 139.6m
c) to get the velocity (v) when distance traveled (s) = 10m, we use the formulae below.
v² = u² + 2as
v² = 60² + 2( 9.8)(10)
v² = 3600 + 196
v² = 3796
v = √3796
v = 61.611m
Answer:
Explanation:
Given
mass of lead piece 
mass of water in calorimeter 
Initial temperature of water 
Initial temperature of lead piece 
we know heat capacity of lead and water are 
and 
respectively
Let us take 
be the final temperature of the system
Conserving energy
heat lost by lead=heat gained by water
The most useful would be a Journal article, many (not all) possess information enough to replicate the experiment in order to increase its validity and to collaborate with the scientific community.
cheers!
Well, it happens a few weeks ahead, then for a total of 3 hours and 40 minutes.
