An object is situated between the focal point and the concave mirror. Which of the following best describes the image produced?
Answer(s): B
It is very important to know the rules of image and object configuration for both concave and convex mirrors in regards to the focal point.The ray diagram below demonstrates the formation of the image from the object in the concave mirror. The image is upright, virtual (“behind” the mirror) and larger than the original object.
A woman is holding a 2 lb ball 3 feet above her head. How much work is the woman doing to keep the object above her head?
Answer(s): A
Given too much information when knowing the concept behind ‘work’ is all that is needed to be solved.Because the ball is held above the woman’s head and is not moving, the woman is not doing any work at all. There is no displacement, and thus, work amounts to 0.
The half-life of an unknown element is 4 days. In an original sample of 50 g, how much of it will have decayed after 12 days?
After 12 days, the element will have undergone a “half-life” of 3 cycles, as each half-life period is 4 days.Thus: 50 g –> 25 g (1 half-life / 4 days) 25 g –> 12.5 g (2 half life / 8 days) 12.5 g –> 6.25 g (3 half life / 12 days)Thus by 12 days, 6.25 g of the element remains. However, since the question asks for the amount that has decayed, simply subtract the original mass with the remaining mass: 50 g − 6.25 g = 43.75 g
Three different objects have the same velocity, and the same mass of 20 kg. Which of the following attributes will these objects have the same value for?
Objects with the same mass and velocity mean they will have the same value for their momentum, as momentum is measured via: mass × velocity.
If Kevin weighs 80 N on planet Earth, what will his weight be on the moon?
Answer(s): C
Weight = mass × gravityKevin will have the same mass on Earth and the moon, but gravity on the moon is lower than the gravity on the Earth. Due to the correlation between weight and gravity, a lower gravity means a lower weight. Hence why Kevin will weigh less on the moon.
A 10 kg box is sitting on a frictionless inclined plane at an angle 10 degrees above the horizontal. What force must Mark apply to the box to prevent it from moving?
The force Mark must apply to prevent the box from moving is mgsinθ.m = 10 kg g = 10 m/s2 (gravity) θ = 10 degreesPlugging these in gives: 10 × 10sin10, hence: 100sin10 N.
Diverging lenses always produce what type of image?
Answer(s): D
All of these characteristics are indeed relevant to diverging lenses as the location of the object is irrelevant compared to converging lenses.
Maria leaves her house and drives to store 'A' for food, then to gas station 'B' and finally back to home. What was her total displacement?
Displacement is change of position from final to initial. Since Maria started at home and ended up at home, her total displacement was 0 miles. If the problem had asked what her distance traveled was, then one would expect it to be the perimeter, which is 12 miles.
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