Answer:
Correct answer: W = 2,240 J
Explanation:
Given:
m = 70 kg
V₁ = 6 m/s
V₂ = 10 m/s
W = ?
Work is a measure of change in this case of kinetic energy:
W = ΔE = (m V₂²)/ 2 - (m V₁²)/ 2 = (m / 2) · (V₂² - V₁²)
W = (70 / 2) · (10² - 6²) = 35 · (100 - 36) = 35 · 64 = 2,240 J
W = 2,240 J
God is with you!!!
Answer:
RT = 17 ohms
Explanation:
For two parallel resistances in a circuit the combined resistance is given by:
R1 = 25 ohms
R2 = 50 ohms
You replace the values of R1 and R2 in the formula for RT:
hence, the combined resitances is 17 ohms
Snell's law describes the relationship between the angles of incidence and refraction.
n1*sin(theta1) = n2*sin(theta2)
When light travels from a medium with a higher refractive index to one with a lower refractive index, a phenomenon known as total internal reflection occurs. The largest possible angle of incidence which still results in a refracted ray is called the critical angle; in this case the refracted ray travels along the boundary between the two media.
theta(crit) = arcsin(n2/n1) where n1>n2.
Assuming light enters the following media and refracts to the air (n=1):
For acrylic: n=1.590, theta(crit)=arcsin(1/1.490)=42.4 degrees
For water: n=1.333, theta(crit)=arcsin(1/1.333)=48.6 degrees
For vegetable oil: n=?
Explanation:
Move the decimal point until it's behind the first digit. Count how many times you move it. In this case, we move it 2 places to the left. So the scientific notation is:
2.200×10²