Another relationship in physics is that describing the energy obtainable if we convert mass to energy, Einstein's famous E=mc2 where the constant c is the speed of light in vacuum. Which of the following correctly expresses this as a proportionality and identifies the constant of proportionality? Question 2Select one: a. E ∝ m , with constant of proportionality c . b. m ∝ c , with constant of proportionality E . c. E ∝ m , with constant of proportionality c2 . d. E ∝ c , with constant of proportionality m . e. m ∝ c2 , with constant of proportionality E .

The energy stored U in a spring which follows Hooke's Law stretched a distance x from its normal length is U=12 kx2 , where k is the spring constant and basically describes how stretchy a spring is. Which of the following choices correctly writes this a proportionality and identifies the constant of proportionality. Question 4Select one: a. U ∝ x with constant of proportionality 12 kx . b. U ∝ x2 with constant of proportionality 12 k . c. U ∝ 12 with constant of proportionality kx2 . d. U ∝ 12 x with constant of proportionality kx . e. U ∝ 12 k with constant of proportionality x2 .

Which of the following could not be a formula for energy?E = mc2 where m is a mass and c is the speed of lightE = mavt, where m is a mass, a is an acceleration, v is a velocity, and t is a timeE = mav, where m is a mass, a is an acceleration, and v is a velocity

Kinetic energy is:inversely proportional to mass and velocitydirectly proportional to mass and velocityinversely proportional to mass and directly proportional to velocitydirectly proportional to mass and inversely proportional to velocity

Newton’s law of universal gravitation is represented by F = GmM r2 . where F is the magnitude of the gravitational force exerted by one small object on another, M and m are the masses of the objects, and r is a distance. Force has the SI units kg · m/s2. What is the SI units of the proportionality constant G? (a) kg · s2/m3 (b) m3/kg · s (c) m2/kg · s2 (d) kg2/m2 (e) m3/kg · s2 Q5: A solid piece of lead has a mass of 23.94 g and a volume of 2.10 cm3. From these data, what is the density of lead in SI units (in mega-gram per cubic meter)? (a) 1.14 M g/m3 (b) 1.14 × 104 M g/m3 (c) 11.4 M g/m3 3

A. Speed of light in vacuum is dependent on the direction of propagation.B. Speed of light in a medium is independent of the wavelength of light.C. The speed of light is independent of the motion of the source.D. The speed of light in a medium is independent of intensity.Choose the correct answer from the question given below :A and C onlyB and D onlyB and C onlyC and D only