PHYSICS MIDDLE SCHOOL

A student pushes a 40-N block across the floor for a distance of 10 m. How much work was applied to move the block? A.
4 J

B.
40 J

C.
400 J

D.
4000 J

Answers

Answer 1
Answer:

The correct answer to the question is C) 400 J.

CALCULATION:

As per the question, the force applied on the block F = 40 N.

The distance travelled by the block S = 10 m.

We are asked to calculate the work done by the block.

The work done by a body under a force F is calculated as -

             Work done W = \vec F.\vec S

                                     = FScos\theta

Here, \theta is the angle between force and displacement.

If \theta =\ 0^(0), then work done W = FScos0

                                                   = FS.     [ cos0 = 1]

Hence, the work done by the block W = FS

                                                                = 40 N × 10 m

                                                                =  400 Joule.         [ans]

Here, Joule is the unit of work.

Hence, the work done by the block s 400 Joule.

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Molecules have properties that are different than ____________that form them

Answers

Isn't it elements cuz molecules are made only out of elements. So that will be the only right answer that is available. 
Elements because only molecules arw made of elements...i think

How must of the roller coaster's kinetic and/or potential energy is in each of the points. For each point, pick one option. (Sorry for the report, I found a mistake in my question and could not edit.)Point A:
a. 1/2 Potential Energy, 1/2 Kinetic Energy
b. 1/2 Potential Energy, 0 Kinetic
c. 100 Potential Energy

Point B:
a. 1/4 Potential, 3/4 Kinetic
b. 100 Kinetic, 0 Potential
b. 1/2 Potential, 1/2 Kinetic

Point C:
a. 1/2 Potential, 1/2 Kinetic
b. 3/4 Potential, 1/4 Kinetic
c. 100 Potential, 0 Kinetic

Answers

Answer

  1. Point A-
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The process of _____________ is modeled in the plant cell diagrams seen here. A) osmosis B) tonicity C) active transport D) facilitated transport

Answers

Answer:

A) Osmosis

Explanation:

The process of osmosis is modeled in the cell diagram

Answer:

osmosis

Explanation:

never heard of the other terms in my 7th grade brain

What is the biggest problem with invasive species in their new location?A They are always stronger than native species.

B They evolve more quickly than native species.

C They have higher reproductive rates than native species.

D They have no population controls such as predators.

Answers

Answer:

Option (C)

Explanation:

Invasive species usually refer to those species that are new to an ecosystem and cause a great impact on the native species. It also affects the ecosystem, economy and the health of human beings. Examples of some invasive species are zebra mussels, killer algae, green crab and Asian carp.

These species are much stronger than the native species and they have the ability to grow at a much faster rate, increasing their population. This increasing rate of population creates a problem for them to survive in a new location.

Thus, the most appropriate answer is option (C).

Answer:

D

Explanation:

The other species had evolved to be able to survive the predators of the area over the years

the difference between speed and velocity is that A) speed is a vector and requires a direction. B) speed is a vector and requires a magnitude. C) velocity is a vector and requires a direction. Eliminate D) velocity is a vector and requires a magnitude.

Answers

The correct answer is C. Velocity is a vector and requires a direction.

Explanation:

In physics both speed and velocity are used to study the motion of a body; however, they are slightly different. In the case of speed, this describes the rate of change in position based on distance and time, because of this, speed is based on a magnitude or quantity. On the other hand, velocity is a vector because it does not only includes a change of position but the direction of motion usually based on a specific location reference.

Considering this, it can be concluded the difference between speed and velocity is that "velocity is a vector and requires a direction" because velocity includes both the distance and time (speed) along with the direction while speed focuses only on time and distance.

The difference between speed and velocity is that C) velocity is a vector and requires a direction

Further explanation

Vector is a quantity that has a value and direction

Vector can be symbolized in the form of directed line segments

\large {\boxed {\bold {\overrightarrow{A}}}

while the length of the vector is denoted by | a |

Vectors can be written in the form of sequential pairs which shows their coordinates in the Cartesian plane: a (a₁, a₂)

with length

\large {\boxed {\bold {|a|=√(a_1^2+a_2^2)  }}

If the direction of the vector is reversed, we get the vector -a which has the same length but in the opposite direction

Operations on vectors include addition and subtraction. Addition of vector a and vector b can be done in a triangular way where the base point of vector b coincides with the endpoint of vector a

The sum of the two is obtained by pulling the line segment from the base point of the vector a to the endpoint of the vector b which results in a new vector c

So a + b = c

If vector a is added by inverse b (-b) then the sum becomes a + (- b) = a-b

If a vector is multiplied by a scalar number (eg denoted by k) then the new vector becomes k | a |.

If k> 0, the new vector is in the direction of vector a, but if k <0 it will be in the opposite direction

A vector has a direction and a magnitude, while a scalar has only a magnitude.

Examples of scalars are: length, mass, time, speed

Examples of vectors are: force, acceleration, velocity

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Answers

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