B) It gains protons and becomes positively charged.
C) The number of positive and negative charges can be the same.
D) It has to be a metal.
E) There is no change in the distribution of the charge in the object.
Answer: Option C: The number of positive and negative charges can be same.
A substance is said to be polarized when there is non-uniform distribution of electric charge. When there gain or loss of electrons, ions are formed. It is not necessary that polarized object is metal. For example, Water is polarized. The oxygen atoms have partial negative charge and hydrogen atoms have partial positive charge.
Answer:
c
Explanation:
100%
A. x>0 but xB. x=A
C. x<0.
D. x=0.
E. None of the above
Answer:
The correct answer is option E. This is because when a body is undergoing simple harmonic motion, the displacement, velocity and acceleration are constantly changing with respect to position and time.
Explanation:
When the body is passing through the equilibrium position so that the displacement at that point is zero, the velocity at that point is either maximum or minimum (Vmax or Vmin) which is dependent on which way the body is moving (the chosen direction of positive sense of motion). At the equilibrium position the acceleration is zero because the net force acting on the body is zero (that is the sun of the forces acting on the body along both directions of motion is equal to zero). Also when the body is at either its maximum positive displacemt, x = +A, or its maximum negative displacement x = -A, the velocity is zero and the body is instantaneously at rest. At this points the force (in either direction) acting on the body has it maximum value and as a result the acceleration has it maximum magnitude whether negative or positive depending on the chosen direction positive sense of motion.
At any other point in the course of the SHM (simple harmonic motion), the velocity (V) and acceleration (a) of the always have nonzero values and as a result they are never simultaneously equal to zero.
Thank you very much reading and I hope this is helpful to you.
When a piece of aluminum foil is taken out of the oven and cools from 100C to 50C. Then the change in temperature is 50°C.
Temperature is a fundamental concept in physics that describes the degree of hotness or coldness of an object or system. It is a measure of the average kinetic energy of the molecules or particles that make up the object or system.
In other words, the temperature is a measure of how fast or slow the particles are moving. When the particles move faster, the temperature is higher, and when they move slower, the temperature is lower. Temperature is commonly measured using a thermometer, which is a device that detects changes in a physical property of a material, such as its volume, pressure, or electrical resistance, that vary with temperature.
The unit of measurement for temperature is the Kelvin (K) scale, although Celsius (°C) and Fahrenheit (°F) scales are also commonly used. The Kelvin scale is an absolute temperature scale, where 0 K represents the lowest possible temperature, known as absolute zero. The Celsius and Fahrenheit scales are relative scales that are defined by the freezing and boiling points of water at standard atmospheric pressure.
Here in the Question,
The change in temperature is 30 because the change in temperature is calculated by subtracting the initial temperature from the final temperature. In this case, the initial temperature is 100°C and the final temperature is 50°C. So the change in temperature is:
Change in temperature = final temperature - initial temperature
Change in temperature = 50°C - 100°C
Change in temperature = -50°C
The negative sign indicates a decrease in temperature, which is expected as the aluminum foil cools down from the higher initial temperature to the lower final temperature.
Therefore, it is common practice to report the absolute value of the change in temperature, which in this case is 50°C.
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Answer:
50°C
Explanation:
The change in temperature is basically the difference between the initial temperature to the final temperature. So change in temperature will be:
100°C - 50°C = 50°C
3. _______ is when either the vertical or the horizontal component of light waves is eliminated.
A. Refraction
B. Scattering
C. Transmission
D. Polarization
b. the velocity of each object.
c. the distance between the objects squared.
d. the mass of one object and the distance between the objects.
B) 20 N/m
C) 12 N/m
D) 25 N/m
E) 390 N/m
Answer: The spring constant is K=392.4N/m
Explanation:
According to hook's law the applied force F will be directly proportional to the extension e produced provided the spring is not distorted
The force F=ke
Where k=spring constant
e= Extention produced
h=2m
Given that
e=20cm to meter 20/100= 0.2m
m=100g to kg m=100/1000= 0.1kg
But F=mg
Ignoring air resistance
assuming g=9.81m/s²
Since the compression causes the plastic ball to poses potential energy hence energy stored in the spring
E=1/2ke²=mgh
Substituting our values to find k
First we make k subject of formula
k=2mgh/e²
k=2*0.1*9.81*2/0.1²
K=3.921/0.01
K=392.4N/m