A flywheel with a moment of inertia of 1.00kg m^2 is rotating at 100 rpm. What torque is required to bring it to rest in 10.0 revolutions?
Answers
torque = (moment of inertia)(angular acceleration)
torque = 1.00 ( 100 )(1/60) / 10
torque = 0.1667 N∙m
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A hollow lens is made of thin glass and in the shape of a double concave lens. It can be filled with air, water of refractive index 1.33 or CS2 of refractive index 1.6. It will act as a diverging lens if it is (A) filled with air and immersed in water. (B) filled with water and immersed in CS2. (C) filled with air and immersed in CS2. (D) filled with CS2 and immersed in water.
Light travels faster in glass than it does in a vacuum. Please select the best answer from the choices provided T F
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Voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of resistance will be 50 V
What is ohm's law ?
Ohm's law is a law that states that the voltage across a resistor is directly proportional to the current flowing through the resistance
using ohm's law
V = IR
V = voltage in a circuit = ?
I = current = 10 A
R = Total resistance in the circuit = 5 ohm
V = IR
= 10 A * 5 ohm
= 50 V
voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of resistance will be 50 V
learn more about ohm's law
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atoms are made of particles that have a negative charge.
electrons in atoms must have varying amounts of energy.
electrons are only found in the nucleus.
Answers
Using a cathode ray tube, Thomson confirmed that atoms are made of particles that have a negative charge., therefore the correct answer is option B
What are atomic models?
There are some models that are used to explain the arrangements of subatomic particles inside the atom based on the atomic theory of atom are known as the atomic models.
J.J. Thomson discovered using cathode ray tubes that something emits from the negative plate (referred to as the cathode) and travels towards the positive plate (referred to as the anode), and that when zinc sulfide (also known as a phosphor) coating is applied to the perforated anode, it exhibits green fluorescence at a specific pressure and temperature values.
Thus,by using a cathode ray tube, Thomson confirmed that atoms are made of particles that have a negative charge., therefore the correct answer is option B
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Option (B) is correct .i.e. atoms are made of particles that have negative charge.
Further explanation:
Using cathode ray tube, J.J Thomson found that something emits from the negative plate (called as cathode) and goes towards the positive plate (called as anode), and on applying zinc sulfide (also called phosphor) coating on the perforated anode, it shows green fluorescence at some particular values of pressure and temperature.
William Crookes called them the cathode rays as were originated from cathode. Further, Atoms are overall neutral having equal amounts of positive and negative charge as he explained in his plum pudding model.
Although, electrons in atoms have varying energy but this was not confirmed by J.J. Thomson, also electrons can’t be inside nucleus because this would make atoms very unstable.
Some of the properties of those cathode rays are as follows:
(1). They are made up of material particles (they made the light wheels rotate that come in their path).
(2). The green fluorescence was also observed when he putted two more plates perpendicular to the earlier path and the rays followed a curved path towards the new anode.
(3). They has an ionizing property (they ionizes the gas present in the cathode ray tube, through which they pass).
Thus, Option (B) is correct because the cathode rays are emitted from the metallic plate which’s atoms have particles having negative charge.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Modern physics
Keywords:
Atoms, cathode, cathode rays, cathode ray tubes, J.J. Thomson, negatively charged particles, nucleus, energy, varying energy, electrons, green fluorescence, phosphor, anode, protons, pressure, temperature, William Crookes.
B. has the ability to create static discharge
C. has an excess or shortage of electrons.
D. has a large atomic nucleus
Answers
Answers
Answer:
Mass, m = 16.02kg
Explanation:
Given the following data;
Force, F = 157N
Since it's a free fall, acceleration, a = g = 9.8m/s² (acceleration due to gravity).
To find the mass;
Force is given by the multiplication of mass and acceleration.
Mathematically, Force is;
Where;
- F represents force measured in Newton.
- m represents the mass of an object measured in kilograms.
- a represents acceleration measured in meter per seconds square.
Making mass (m) the subject of formula, we have;
Substituting into the equation;
Mass, m = 16.02kg
Therefore, the mass of the rock is 16.02kg.
Answers
A.) sodium and sodium chloride
B.) sodium chloride and chlorine
C.) sodium and chlorine
Answers
The correct choice is
C.) sodium and chlorine
In a reaction, reactants are the compound or elements which gets combined or reacts to give another compound known as product. Here sodium is getting combined with chlorine gas to give the product as sodium chloride. hence Sodium and chlorine can be termed as reactants and sodium chloride can be termed as product.