To solve this problem we will apply the concept of magnification, which is given as the relationship between the focal length of the eyepieces and the focal length of the objective. This relationship can be expressed mathematically as,

Here,
= Magnification
= Focal length eyepieces
= Focal length of the Objective
Rearranging to find the focal length of the objective

Replacing with our values


Therefore the focal length of th eobjective lenses is 27.75cm
Answer:
the work done by friction on the car is 524,582 J.
Explanation:
Given;
mass of the roller coaster, m = 800 kg
distance moved by the coaster, d = 225 ft = 68.58 m
final velocity of the coaster, v = 80 mi/h = 35.76 m/s
The time taken for the coaster to drop down the hill is calculated as;

The work done by friction on the car is calculated as;

Therefore, the work done by friction on the car is 524,582 J.
Standard sea level pressure by definition equals 760 mm (29.92 inches) of mercury
Answer: 329.28 m/s
Explanation:
Given that:
Distance of sound = 823.2 m
Time taken for sound = 2.5 seconds
The speed of traveling sound = ?
Speed is obtained by dividing the distance travelled by the time taken for the travel.
Speed = Distance / time
Speed = 823.2m/2.5 seconds
Speed = 329.28 m/s
Thus, the sound traveling as fast as 329.28 m/s
Answer:
0.001067 Wb
Explanation:
Parameters given:
Magnetic field, B = 0.77 T
Angle, θ = 30º
Width = 0.4cm = 0.04m
Length = 0.4cm = 0.04m
Magnetic flux, Φ(B) is given as:
Φ(B) = B * A * cosθ
Where A is Area
Area = length * width = 0.04 * 0.04 = 0.0016 m²
Φ(B) = 0.77 * 0.0016 * cos30
Φ(B) = 0.00167 Wb