It can help to keep your fitness schedule organized and keep you motivated
Answer:
19.98Joules
Explanation:
Energy possessed by the body is the kinetic energy
Kinetic Energy = 1/2mv²
m is the mass
v is the velocity
For the 4kg moving at 6m/s
kE = 1/2 * 4 * 6^2
KE = 1/2 * 4 * 36
KE = 72Joules
For the 4kg moving at 5.1m/s
kE = 1/2 * 4 * 5.1^2
KE = 1/2 * 4 *26.01
KE = 52.02Joules
Amount of Energy lost = 72 - 52.02
Amount of Energy lost = 19.98Joules
Hence the amount of Energy lost is 19.98Joules
Answer:
0.5 secs
Explanation:
F = m( v - u) /t
Mass m = 1000kg
Velocity v = 40m/s because it came to rest
time t = ?
Force = 80kN
= 80 x 1000 = 80000N
Therefore,
80000 = 1000 x 40 /t
Cross multiply
t x 80000 = 40000
Divide both sides by 80000
t = 40000/80000
t = 0.5 secs
Answer: The correct answer is:
Galileo used instruments and experiments to show him what nature was doing, instead of relying on pure logic
Explanation:
Galileo can be considered as one of the precursors of experimentation and the scientific method. A method that doesn't rely on "common sense" and rationalization and logic, but instead is fuelled by a disposition of skepticism and rather makes claims about reality based on experimentation and empirical data shows.
Galileo differed from his predecessors because he actually used and developed instruments and method to reliable measure and observe what nature was doing, instead of relying on pure logic.
So the formula for density is mass divided by volume, so it would be