The product of an object’s mass and velocity is its momentum. Therefore, option B is correct.
The sum of a particle's mass and velocity is called momentum. As a vector quantity, momentum possesses both magnitude and direction. According to Isaac Newton's second equation of motion, the force applied on a particle is equal to the time rate of change of momentum.
The link between an object's mass, velocity, and direction is provided by momentum. Force is the outcome of any change in momentum. Therefore, the force acting on the object is determined using a change in momentum.
The momentum is the quantity of motion. As an object has momentum if it is moving and has mass, quantity may be measured in this situation. An object lacks momentum if it is immobile.
Thus, option B is correct.
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B compassion
C confidence
D courage
Answer:
c
Explanation:
A. float
B. sink
C. sink, then float
An object will float when:
A. buoyant force is equal to the weight of the object
B. buoyant force is less than the weight of the object
C. density is equal to the weight of the object
D. density is greater than the weight of the object
What is the buoyancy force on a 15 g object which displaces 60 mL of water? (Remember to change mL of water to grams and grams to kg)
A. 900 N
B. 25 N
C. 0.59 N
D. 0.25 N
An object has a density of 20 g/cm3. When placed in a cylinder, it displaces 5 mL of water. What is the mass of the object?
A. 0.25 g
B. 4.0 g
C. 100.0 g
Substance has a mass of 16.2 grams. It displaces 8.1 grams of water. What is its specific gravity?
A. 2.0
B. 5.5
D. 131.22
1) A. float
There are two forces acting on an object in the water: the weight of the object (downward) and the buoyancy (upward), which is equal to the weight of displaced water. If the weight of displaced water is greater than the weight of the object, it means that there is a net force directed upward, so the object will float.
2) A. buoyant force is equal to the weight of the object
As stated in the previous question, there are only these two forces acting on an object in the water (buoyant force and weight of the object), so if the two forces are equal, then the object is in equilibrium, so it will float.
3) C. 0.59 N
The buoyancy force is given by:
where
is the density of the liquid (water)
is the volume of displaced water
is the acceleration of gravity
Substituting numbers into the formula, we find
4) C. 100.0 g
The density of the object is 20 g/cm^3, which is greater than the density of the water (1 g/cm^3): this means that the object will sink, so its volume is equal to the volume of displaced water.
Therefore, we have:
- object's density:
- object's volume:
so, the mass of the object is
5) A. 2.0 g
The specific gravity of an object is given by the ratio between its density () and the density of a reference substance (), in this case water:
whe can rewrite each density as the ratio between mass and volume:
where the suffix o refers to the object, while the suffix w refers to the water. However, if we assume that the object is completely in the water, the two volumes are equal, so we can simplify the formula:
Answer: True
Explanation: A sonographer can adjust the duration of an acoustic pulse because it depends on the pulse's propagation speed.
energy is released when matter is destroyed
B
mass and energy are equivalent
C
the law of conservation of energy must be modified to state that mass and energy are conserved in any process
D
all of the choices
The rate at which electrical energy is converted to another form of energy is called power.
In an electric circuit, electrical energy is continuously converted into other forms of energy. For example, when a current flows in a conductor, electrical energy is converted into thermal energy within the conductor. This process is called power. Power is the rate at which energy is transferred or work is done, and is measured in watts.
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