The gravitational acceleration is measured at 3.16 m/s² by the pendulum method.
We need to know about the pendulum to solve this problem. The periods of the pendulum depend on the length of the string and gravitational acceleration. It can be determined as
T = 2π√( l / g )
where T is periods, l is the length of string, and g is gravitational acceleration.
From the question above, we know that:
l = 2 m
T = 5 s
By substituting the following parameters, we get
T = 2π√( l / g )
5 = 2π√( 2 / g )
(5/2π)² = ( 2 / g )
g = 3.16 m/s²
Hence, the gravitational is measured at 3.16 m/s² by the pendulum method.
For more on pendulum at: brainly.com/question/26449711
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F = ma
20 N = 20kg * a
a = 20 N /20kg
acceleration = 1 N/kg or 1 m/s²
Answer:
1) Skis have a large area to reduce the pressure on the snow. This ensures that the skis do not sink into the snow too far.
2) The pressure under the studs on the soles of football shoes is high enough for them to sink into the ground, which gives extra grip.
3) A vacuum cleaner has a fan inside that creates a low pressure inside the device. Consequently, air and dirt particles are sucked into the device.
Weight = mg Mass, m = 8kg, g ≈ 9.8 m/s² on Earth
W = 8*9.8
W ≈ 78.4 N
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