A ray of light traveling in the air strikes water (n = 1.33). In which direction does the light bend?
Answer(s): A
Since light is going from a lower index of refraction (n) to a higher index of refraction, it will always bends towards the normal.
A joule is equal to:
Answer(s): C
A joule is indeed equal to this. Joule, the unit of work, can be identified as equal to force x distance.Force (in newtons), is equal to mass × acceleration.Mass = kg Acceleration = m/s2 Distance = mThus, combining all these terms by multiplying them: kg × (m/s2) × m = (kg × m2) / s2
An optical system has a focal length 30 cm away from the mirror, and an object 5 cm farther out from the focal point. What is the distance of the image formed in this concave mirror?
Di = Image distance Do = Object distance f = focal distance(1 / f) = (1 / Di) + (1 / Do)Rearrange to solve for Di: Di = (1 / f) − (1 / Do) (1 / Di) = (1 / 30) − (1 / 35) (1 / Di) = 1 / 0.0048Inverse both sides to get Di: ~210 cm.
What is the hydrostatic pressure in a pond at a depth of 100 m? (Density of water = 1000 kg/m3)
Hydrostatic Pressure = ρgDwhere:ρ = Density of fluid (1000 kg/m³ here, as given) g = Gravity (unless stated otherwise, this is 10 m/s²) D = Depth (100 m, as given)Simply plug and chug. Remember the SI unit of pressure is Pascal (Pa). Since all given units are in their respective SI formats, no conversion is needed.
A yoyo is being swung around with an angular velocity of 30 and a radius of 3. What is the yoyo's linear velocity?
The relationship between angular velocity to linear velocity is:v = wrv = linear velocity; w = angular velocity; r = radiusIgnoring units for this problem to make it easier, we find v = 30 × 3 = 90.
For the following vector, if θ was 60°, what will be the measure of the 'x' component of this vector?
Answer(s): E
Without the magnitude of the vector itself, one cannot calculate the x or y components of the vector. You would need the angle (provided) and the magnitude (not provided) to calculate either components.
A thermostat with an initial reading of 100°F rises up by 50°F in 20 minutes. What is the final temperature reading of the thermostat in Celsius?
This is a simple conversion problem that may appear in either (or both) the physics and QR section. It is important you understand how to convert between Celsius, Fahrenheit and Kelvin.°K = 273.15 + °C °C = 5/9 × °F − 32 °F = 9/5 × °C + 32Using the 2nd equation above, plugging in 150 for F produces ~65.5 °C
For the incline plane diagram below, which of the answer choices best represents the normal force experienced by this block?
In an inclined plane, the normal force is mgcosθ. It is important you know all aspects of a incline plane problem as it is an almost guaranteed question. If one did not know the equation for the normal force, one could not calculate it if presented with numbers.
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