PLEASE SOMEONE HELP ME WITH THIS DARN QUIZ. I'm so lost and all my teachers are too 'BUSY' to help me. :/ I'm getting so sick and tired of studying and not getting it but then having to take the blame for my instructor's folly.
2. Which of the following is a requirement that units in a correct formula or equation must always satisfy?
(Points : 1)
Each unit in the formula, expressed in SI base units, must be the same.
The units on both sides of the equals sign, expressed in SI base units, must be the same.
All units must be units only of mass, length, or time.
All masses must be in kilograms, all lengths in meters, and all times in seconds.
3. Momentum is a physical quantity calculated by multiplying mass by velocity (mv). Which of the following are equivalent units of momentum? Consult a table of units if you do not know, for example, what J is in base units. You may refer to the SI Derived Units chart on page 235 of Physics: Problems and Solutions to answer this question.
(Points : 1)
m/s
gramscentimeters
Ns
Js
4. A quantity called the impulse is the average force, in newtons, multiplied by the time the force is acting. Which of the following is a unit of impulse?
(Points : 1)
Js
J/kg
N/s
Ns
5. The electric field times the electric charge of a particle gives the electric force acting on the particle. The charge has units of coulombs (C) and the force is expressed in newtons (N). Suppose you are solving a physics problem in which you calculate an electric field. Which of these is a unit that your answer might have?
(Points : 1)
N
Ns
N/C
NC
1.The units on both sides of the equals sign, expressed in SI base units, must be the same.
3.Ns (mv=Ft)
4.Ns
5.N/C
1.The units on both sides of the equals sign, expressed in SI base units, must be the same.
3.Ns (mv=Ft)
4.N.s
5.N/C
i am also confused
2. The requirement that units in a correct formula or equation must always satisfy is that the units on both sides of the equals sign, expressed in SI base units, must be the same. To determine the correct answer, you can go through each option and evaluate if it satisfies this requirement.
Step 1: Read the options and understand the requirement.
Step 2: Evaluate each option.
- Option 1: Each unit in the formula, expressed in SI base units, must be the same. This is a requirement, but it doesn't mention the units on both sides of the equals sign. So, it's not the correct answer.
- Option 2: The units on both sides of the equals sign, expressed in SI base units, must be the same. This directly states the requirement and is the correct answer.
- Option 3: All units must be units only of mass, length, or time. While this is a requirement, it doesn't mention the units on both sides of the equals sign. So, it's not the correct answer.
- Option 4: All masses must be in kilograms, all lengths in meters, and all times in seconds. This option specifies the units of mass, length, and time, but it doesn't mention the units on both sides of the equals sign. So, it's not the correct answer.
Therefore, the correct answer is Option 2: The units on both sides of the equals sign, expressed in SI base units, must be the same.
3. To determine which of the following are equivalent units of momentum, you can consult a table of units or refer to the SI Derived Units chart on page 235 of Physics: Problems and Solutions.
Step 1: Read the options and understand what momentum is.
Step 2: Evaluate each option.
- Option 1: m/s. This is the unit for velocity, not momentum.
- Option 2: gramscentimeters. This is not a standard unit for momentum.
- Option 3: Ns. This is the unit of momentum.
- Option 4: Js. This is also the unit of momentum.
Therefore, the correct answers are Option 3: Ns and Option 4: Js.
4. To determine the unit of impulse, you can use the given information that impulse is the average force, in newtons, multiplied by the time the force is acting.
Step 1: Read the options and understand what impulse is.
Step 2: Evaluate each option.
- Option 1: Js. This is the correct unit for impulse since it is the product of force (in N) and time (in s).
- Option 2: J/kg. This is not the unit for impulse; it represents energy per unit mass.
- Option 3: N/s. This is not the unit for impulse; it represents a rate of change of force.
- Option 4: Ns. This is not the unit for impulse; it represents a unit of torque.
Therefore, the correct answer is Option 1: Js.
5. If you are solving a physics problem in which you calculate an electric field, the unit that your answer might have can be determined by understanding the relationship between electric field, electric charge, and electric force.
Step 1: Read the options and understand the relationship between electric field, electric charge, and electric force.
Step 2: Evaluate each option.
- Option 1: N. This represents force, not electric field.
- Option 2: Ns. This represents impulse, not electric field.
- Option 3: N/C. This is the correct unit for electric field since it represents force per unit charge.
- Option 4: NC. This is not a standard unit for electric field.
Therefore, the correct answer is Option 3: N/C.