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The two forces acting on your body are the weight and the normal force
Explanation:
As you sit on your chair in front of the computer, there are 2 forces acting on you:
- The force of gravity, of magnitude
(where m is your mass and
is the acceleration of gravity), acting downward
- The normal reaction exerted by the chair on your body, N, acting upward, and balancing your weight
We can apply Newton's second law to this situation; the law states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:
where
is the net force
m is the mass
a is the acceleration
For your body sitting on the chair,
we also know that your body is at rest, so the acceleration is zero:
This means that the net force is zero, and therefore:
Learn more about Newton's second law of motion:
#LearnwithBrainly
Answer:
b) 2.2 kg
Explanation:
Net force acting on an object is the sum of the two forces acting on the body.
The net force is calculated using the parallelogram law of vectors.
F =
Here A = 20 N , B = 35 N and θ =80°
Net Force = F = 43.22 N
Acceleration = a = 20 m/s/s
Since F = ma, m = F/a = 43.22 / 20 = 2.161 kg = 2.2 kg
Answer:
The new water temperature is 26.4 °C
Explanation:
Given;
mass of copper, = 26 g = 0.026 kg
temperature of copper, t = 300 °C
volume of water, V = 120 mL = 0.12 L
temperature of water, t = 21 °C
density of water, ρ = 1 kg/L
mass of water = density x volume
mass of water = (1 kg/L) x 0.12 L = 0.12 kg
heat lost by copper = heat gained by water
Both copper and water reach final temperature, T
Heat gained by water, =
cΔθ =
Heat lost by copper is given by;
504(T- 21) = 10.01(300 - T)
504 T - 10584 = 3003 - 10.01 T
504 T + 10.01 T= 3003 + 10584
514.01 T = 13587
T = (13587) / 514.01
T = 26.4 °C
Therefore, the new water temperature is 26.4 °C