Answer:
0.07142 m/s in the opposite direction of the bullet
Explanation:
= Mass of rifle = 70 kg
= Mass of bullet = 0.01 kg
= Velocity of rifle
= Velocity of bullet = 500 m/s
As the momentum of the system is conserved
The recoil velocity of the rifle is -0.07142 m/s
The negative sign shows the opposite direction of the rifle.
Answer:
C) 100N
Explanation:
Formula for calculating the Weight of an object is expressed as;
Weight = mass × acceleration due to gravity
Given
Mass of the object = 10kg
Acceleration due to gravity = 9.81m/s²
Substitute into the formula above
Weight = 10×9.81
Weight = 98.1N
Hence the approximate weight of the object is 100N
Given conditions:
height of object = 7.5cmdistance of object from mirror = 14 cmfocus length = -7 cmimage distance = ?
Using mirror formula:
1/(focus length) = 1/(object distance) + 1/(image distance)
or, -1/7 = 1/14 + 1/(image distance)
or, image distance = -4.66cm (the image formed is a virtual image)
Also, magnification of image is:
image height /height of object = - image distance /object distance
or, image height = - image distance / object distance * height of object
or, image height = -(-4.66) / 14 * 7.5 = 2.49 = 3(nearest whole number)
We look at the criteria to select a car.
If we are not too rich, we have to bother about fuel efficiency. The mileage in terms
of km per liter or miles per gallon etc.
engine power - whether it is good enough over a slope (steep) that I may encounter
frequently with my family members.
internal space / total external size : or internal space / total price:
We find these numbers. after all , we make use of the internal space on seats.
we have to know its proportion in the total volume of the car.
the axle turning capability, wheel turning ability :
see the minimum radius and span required to turn a car in a U turn.
we have to bother about its pollution, emission level.
height / width ratio, which is important for the balance of the car.
==================================
If we are looking at the economic point of view
monthly benefit/savings of using the car,converted into currency - Loan EMI
Answer:
275 kPa
Explanation:
mass of the gas=m=1.5 kg
initial volume if the gas=V₁=0.04 m³
initial pressure of the gas= P₁=550 kPa
as the condition is given final volume is double the initial volume
V₂=final volume
V₂=2 V₁
As the temperature is constant
T₁=T₂=T
=
putting the values in the equation.
=
P₂=
P₂=
P₂=275 kPa
So the final pressure of the gas is 275 kPa.
