Mass and weight are similar but not the same thing. In which of the following examples would the objects weight change, but made stay the same? An astronaut travels from the earth to the moon
A child grows taller
An overweight person goes on a diet
A snowball rolls downhill and picks up snow making it grow
Answers
we know that , weight of an object is given as
W = mg
where W = weight , m = mass of the object and g = acceleration due to gravity at that place.
An astronaut travels from the earth to the moon :
as the astronaut travels from the earth to the moon, the mass of astronaut stays the same but the weight change as acceleration due to gravity change since acceleration due to gravity on moon is only 1/6 times that on earth.
A child grows taller :
as child grows taller , he gains body mass . hence both mass and weight change.
An overweight person goes on a diet :
as an overweight person goes on diet , he loose body mass . hence both mass and weight change.
A snowball rolls downhill and picks up snow making it grow :
As snowball rolls downhill , it gains snow, hence its mass and in turn the weight change.
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b. variable
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According to Ohm’s law, the ratio of voltage to current in a conductor is constant.
Answer: Option A
Explanation:
Ohm's law defines that an electric current flowing through the conductor between two ends is directly proportionate to the voltage at these two points. The introduction of a constant proportionality, resistance, gives a simple mathematical equation describing this relationship. Particularly, Ohm's law also mentions that R is constant in this respect, i.e. not dependent on the current.
Where,
I is the current conduction in amperes
V is the voltage calculated by the conductor in volts
R is the conductor’s resistance in ohms.
Answer:
Ohm's law states that the ratio of voltage (potential) to current is a constant in a conductor.
Explanation:
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The answer has the be the fourth option "the object is not accelerating." By looking at the graph you would see the the velocity is constant meaning it staying the same and its not increasing or decreasing which takes out the first, second, and third option. So, since how the velocity is not increasing the object is not accelerating or the fourth option.
Hope this helps!
sense the time shown is increasing but the velocity is neither increasing or decreasing then the answer would have to be D.
b)element
c)mixture.
d)compound.
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Answer: c) mixture.
Explanation:
An atom is the smallest entity of any substance which consists of subatomic particles called as neutrons, protons and electrons.
An element is a pure substance which is composed of atoms of similar elements. Example:
Mixture is formed when atoms of similar or different elements are mixed in no fixed ratio without any chemical combination.
A compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass. Example:
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Answer:
During high fever a wet cloth is kept on the forehead of a person to decrease the temperature of body. ... When the wet cloth is placed on the forehead, water in wet cloth starts to evaporate and it starts to absorb a lot of heat from our body. Hence it is used to decrease the temperature of body.