Answer: barometer
Explanation: An instrument that measures air pressure is called a barometer. One of the first barometers was developed in the 1600s. The original instrument had mercury in the small basin, with an upside down glass tube placed in the mercury.
coefficient of static friction is 1.7329
Explanation:
given data
velocity = 60 mph
acceleration = 17 m/s²
to find out
coefficient of static friction
solution
we will apply here centripetal force equation
that is
m×v²/r = µ × m × g ..................1
here v²/r is centripetal acceleration and m is mass and µ is coefficient static friction so
µ = a / g
µ = 17 / 9.81
µ = 1.7329
so coefficient of static friction is 1.7329
Answer:
An unmoving object will remain unmoving and a moving object in motion will continue to be in motion with the same velocity unless an external force acts upon it.
Answer:
An induced current flow counterclockwise in the loop of wire
Explanation:
The magnetic field directed normally up wards and the magnetic flux directed upwards decreases suddenly.
The reduction in magnetic flux induces the EMF and current.
Magnetic field B points upward i.e. along she +z axis
B= z•k
Since the magnetic field vanishes, then, B=0
The force in field is given as
F=L( i×B)
For the magnetic field to vanish, the current has to move in opposite direction i.e. counterclockwise the loop wire.
Therefore the induced EMF and current will try to nullify this effect by producing more magnetic field directed up wards from the plane of the surface and this current have to flow in opposite or counterclockwise direction.
Answer:
B. equals zero
Explanation:
Given data
one complete cycle = heat flow
solution
we have given that when heat engine complete 1 cycle change in energy = net heat flow
that is always equal to zero
from first law of thermodynamics that
ΔU = Q + W
we know ΔU is the change internal energy in system and Q is net heat transfer in system and W is net work done in system
therefore change of internal energy during one cycle
ΔU = Ufinal - Uinitial
ΔU = Uinitial - Uinitial = 0