Larry Finkelstein, Norman Fischer, and Cassius Schwartz have been overlooked, in my opinion.
Answer:
a) heavier on sun
b) 63.0 kN
Explanation:
The weight is directly related to gravity, so because the sun has a bigger gravity than earth the barbell will be heavier on the sun.
the force exerted by the gravity is defined as:
Using SUVAT (S is displacement, U is initial Velocity, V is final velocity, A is acceleration, t is time);
S = 80m
U = 0ms^-1
V = ?
A = 9.8ms^-2
T = XXX
Use S U and A to find V;
V^2=U^2+2AS
V^2=0+2*80*9.8
V^2=1568
V=39.6ms^-1
350 x 8,500,000 = 2,975,000,000 = 2.975 x 10^9
0.006 x 4000 = 24 = 2.4 x 10
2,975,000,000 / 24 = 2.975 x 10^9 / 2.4 x 10 =
2.975 x 10^8 / 2.4 = 1.24 (rounded) x 10^8
Answer:
560 ft lb
Explanation:
We are given that a heavy rope 40 ft long ,weighs 0.7 lb/ft and hang over the edge of a building 90 ft high.
We have to find the amount of work is done in pulling the rope to the top of the building
Suppose start subdividing the length which is the longest distance any point on the rope can travel into n equal sub-intervals
Length of sub-intervals=
.For each i we choose x_i*
Weight density =0. lb/ft
Using rieman sum we are finding approximation work done
delta x
Total approximation work done
delta x
When n tends to infinity then we get
Total work done
=560 ft lb.
The amount of work is done in pulling the rope to the top of the building=560 ft lb