A shock absorbent mattress is built such that the boxspring
of the bed absorbs pressure that is exerted to the bed. Hence, if you jump on
the mattress, you would not bounce up and down as much as a normal mattress
because the springs do not oscillate much. This is done to endure wear and
tear.
Answer:
y = 1.06 x + 0.14
r² = 0.95
Explanation:
a) To make this graph, a spreadsheet-type calculation program is used, see attached.
On the y axis are the measured values
On the x-axis, the values checked in the experiment are placed.
From the graph we see that a linear graph and that one of the values has a strong deviation with respect to the others
b) The red line is the best straight line that can be drawn,
for this the quality ajust is r²
the closer to 1 the better the fit
the equation of the line is
y = 1.06 x + 0.14
r² = 0.95
Answer:
C) According to the second law of thermodynamics, not all energy from the burnt fuel is used to do work on the piston. It also produces heat which warms other parts of the car.
Explanation:
A) According to the fourth law of thermodynamics, the temperature of the other parts of the car increases due to the coolant used for the engine.
B) According to the first law of thermodynamics, the hood of the car heats up using heat from the surroundings in-order to achieve thermal equilibrium with the engine.
C) According to the second law of thermodynamics, not all energy from the burnt fuel is used to do work on the piston. It also produces heat which warms other parts of the car.
D) According to the third law of thermodynamics, the increase in the velocity of the car changes the entropy of the tires. To balance this change, the temperature of the other parts is increased.
Answer:
Vi = 24.14 m/s
Explanation:
If we apply Law of Conservation of Energy or Work-Energy Principle here, we get: (neglecting friction)
Loss in K.E of the Rock = Gain in P.E of the Rock
(1/2)(m)(Vi² - Vf²) = mgh
Vi² - Vf² = 2gh
Vi² = Vf² + 2gh
Vi = √(Vf² + 2gh)
where,
Vi = Rock's Speed as it left the ground = ?
Vf = Final Speed = 17 m/s
g = 9.8 m/s²
h = height of rock = 15 m
Therefore,
Vi = √[(17 m/s)² + 2(9.8 m/s²)(15 m)]
Vi = √583 m²/s²
<u>Vi = 24.14 m/s</u>
Answer:
980 kJ
Explanation:
Work = change in energy
W = mgh
W = (1000 kg/m³ × 5.0 m³) (9.8 m/s²) (20 m)
W = 980,000 J
W = 980 kJ
The pump does 980 kJ of work.
