Answer:
It will take 666.7 seconds for him to complete 2 km run.
Explanation:
1 km → 1000 m
2 km → 2000 m
Here the distance is 2000 m and speed is 3 m/s
seconds _____in four significant figures.
Answer:
Explanation:
Given that,
Spring constant k=200N/m
Compression x = 15cm = 0.15m
Attached mass m =2kg
Coefficient of kinetic friction uk= 0.2
The energy in the spring is given as
U =½kx²
U = ½ × 200 × 0.15²
U = 2.25J
Force in the spring is given by Hooke's law
F = ke
F = 200×0.15
F = 30N
The weight of body which is equal to the normal is give as
W = mg
W = 2 × 9.81
W = 19.62N
W = N = 19.62 Newton's 2nd Law
From law of friction,
Fr = uk•N
Fr = 0.2 × 19.62
Fr = 3.924
Using newton second law again
Fnet = F - Fr
Fnet = 30 - 3.924
Fnet = 26.076
Work done by net force is given as
W = Fnet × d
W = 26.076d
Then, the work done by this net force is equal to the energy in the spring
W = U
26.076d = 2.25
d = 2.25/26.076
d = 0.0863m
Which is 8.63cm
So the box will slide 8.63cm before stopping
Energy in a machine can be something technical like a wire or something went wrong with the system
Mass=highest of neutron almost same of proton and mass of electrons is 1/1840 of protons the charge on neutron is neutral positive on Proton and negative on electrons Neutron and protons are inside the nucleus and keep the electron orbiting around them in different shells..