Lifting a piano into a truck is an example of doing negative work. A. True B. False

Thalia is drafting a plan to move a large, perfect sphere concrete sculpture that is in front of her office building. Describe t

Marina86 [1]

For the answer to this question,
Thalia must consider the weight of the object and the mass of the sculpture. Weight and mass are different things. She should also consider the time on how long it will take to move it and where she'll move it.

4 0

3 years ago

Read 2 more answers

Characteristics that a scientific measuring tool should have

bixtya [17]

Answer:

RELIBILITY - is the consistency of your measurement, or the degree to which an

instrument measures the same way each time it is used under the same condition with the

same subjects. In short, it is the repeatability of your measurement. A measure is considered

reliable if a person's score on the same test given twice is similar. It is important to

remember that reliability is not measured, it is estimated. A good instrument will produce

consistent scores. An instrument’s reliability is estimated using a correlation coefficient of

one type or another.

VALIDITY

VALIDITY - Validity is the extent to which a test measures what it claims to measure. It is

vital for a test to be valid in order for the results to be accurately applied and interpreted.

Validity isn’t determined by a single statistic, but by a body of research that demonstrates

the relationship between the test and the behavior it is intended to measure. There are three

types of validity: It is the strength of our conclusions, inferences or propositions. More

formally, Cook and Campbell (1979) define it as the "best available approximation to the

truth or falsity of a given inference, proposition or conclusion."

PRACTICIBILITY

PRACTICIBILITY - It should be feasible & usable. Quality of being usable in context to the

objective to be achieved.

USABILITY

USABILITY(practicality) ease in administration, scoring, interpretation and application, low

cost, proper mechanical make – up

MEASUREABILITY

MEASUREABILITY - It should measure the objective to be achieved.

Explanation:

5 0

2 years ago

One event occurs at the origin at t equal to zero, and a second events occurs at the point x=5m along the x-axis at time with ct

Anastasy [175]

Answer:

The separation will be spacelike.

The first event can't cause the second event, as there exist an frame of reference in which both happens at the same time, in different positions, so, if there were causally connected, it will imply an instant connection, this is faster than light.

Explanation:

We can define the separation between two events (using the + - - - signature) as :

$(\Delta s )^2 = (ct_2 - c t_1 )^2 - (x_2 - x_1)^2$

where the separation will be lightlike if is equal to zero, timelike if is positive and spacelike if is negative.

For our problem

$c t_1 = 0$

$x_1 = 0$

$ct_2 = 4 \ m$

$x_2 = 5 \ m$

$(\Delta s )^2 = (4 \ m - 0 )^2 - ( 5 \ m - 0)^2$

$(\Delta s )^2 = (4 \ m )^2 - ( 5 \ m 0)^2$

$(\Delta s )^2 = 16 \ m^ 2 - 25 \ m^2$

$(\Delta s )^2 = - 9\ m^2$

So the separation will be spacelike, and the first event can't cause the second event, as there exist an frame of reference in which both happens at the same time, in different positions, so, if there were causally connected, it will imply an instant connection, this is faster than light.

8 0

3 years ago

List the laws of thermodynamic and describe their relevance in the chemical reactions2. Define the standard reduction potential.

Alenkinab [10]

<h2>Energy remains constant </h2>

Explanation:

Thermodynamic Laws -

The primary law, otherwise called the Law of Conservation of Energy, expresses that energy remains constant in the overall reaction, it is not created or destroyed.

The second law of thermodynamics expresses that the entropy increases. after the completion of the reaction of any isolated system

The third law of thermodynamics expresses that as the temperature reaches towards an absolute zero point the entropy of a system becomes constant.

Standard Electronic potential -

The standard reduction potential may be defined as the tendency of a chemical species or the reactants to get into its reduced form after the overall reaction.

It is estimated at volts.

The more is the positive potential the more is the reduction of the chemical species

Aerobic grow is much more efficient at making ATP because of the presence of oxygen the cycles in the respiration are carried out at an efficient rate which forces the cell to undergo a much large amount of ATP production.

6 0

3 years ago

Type the correct answer in the box. Use numerals instead of words. Frank has a sample of steel that weighs 80 grams. If the dens

ad-work [718]

Answer:

10cm^3

Explanation:

Given data

Mass of steel = 80grams

density of steel= 8 g/cm^3

We know that the formula for density is given as

density= mass/volume

make volume subject of formula

volume= mass/density

volume=80/8

volume= 10cm^3

Hence, the volume 10cm^3

8 0

3 years ago