Answer: The coefficient of kinetic friction is μ = 0.6
Explanation:
For an object of mass M, the weight is:
W = M*g
where g is the gravitational acceleration: g = 9.8m/s^2
And the friction force between this object and the surface can be written as:
F = W*μ
where μ is the coefficient of friction (kinetic if the object is moving, and static if the object is not moving, usually the static coefficient is larger)
In this case, the weight is:
W = 20N
And the friction force is:
F = 12N
Replacing these values in the equation for the friction force we get:
12N = 20N*μ
(12N/20N) = μ = 0.6
The coefficient of kinetic friction is μ = 0.6
Answer:111.63 joules
Explanation:
Kinetic energy=(massx(velocity)^2)/2
Kinetic energy=(6×(6.1)^2)/2
Kinetic energy=(6×37.21)/2
Kinetic energy=223.26/2
Kinetic energy=111.63 joules
Answer:
The mass of the astronaut is approximately 119.74 kg
Explanation:
Assuming this problem as a Simple Harmonic Motion of a mass-spring system, the period (T) of the oscillations for a mass (m) and spring constant (k) is:
(1)
First, we have to calculate the spring constant using equation (1) and the data provided for the oscillations without the astronaut:
<em>(it’s important to note that one complete vibration is the period of the movement)</em>
Now with the value of k, we can use again (1) to find the mass of the astronaut (Ma) that makes the period to be 2.54 seconds
Answer:
an apple that fell down from a tree
Explanation:
he wondered what force was acting as the apple fell , he later termed it as a downward force acting on the earth called <em>gravity</em>.
Answer:
a) intensity 
b) E = 0.0406 V/m
Explanation:
given data:
Power = 30 kW
R = 33×10^3 M
1) Intensity is given as
2) electric field is given as
Solving for E
E = 0.0406 V/m
