1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
malfutka [58]
3 years ago
9

Sort these statements about machines based on whether they are correct or incorrect.

Physics
2 answers:
insens350 [35]3 years ago
8 0

as well.

1. Correct

Explanation

An inclined plane is a flat  surface which lie at an angle, Its one end is higher than the other this inclined plane is used as an aid for raising or lowering a load. Staircase also work in similar manner

2. Correct

Explanation

yes all simple machine have a fulcrum

3. Incorrect

Explanation

when we swim that time our arms and legs 'push' the water due to which water displaced in backward direction so her we applied a positive work on the water. According to Newton's Third Law,same magnitude of work is done by water in opposite direction to push us back on our arms and legs. therefore water also does positive work on us.

4. incorrect

Explanation

The force exerted by a machine on an object is input force

5.  Incorrect

Explanation

when the input force is greater than the output force that time machine have mechanical advantage of less than 1.


givi [52]3 years ago
8 0

Answer: I just took the test! I hope this helps.

<em>Correct-</em>

When a person swims through  water, no work is done.

All simple machines have a fulcrum.

A machines power depends on how fast the machine is able to do work.

<em>Incorrect-</em>

A staircase is an example of an inclined plane.

The force exerted by a machine on an object that's lifted or moved is the output force.

All machines have a mechanical advantage of 1 or more than 1.

You might be interested in
How much heat is released when 35kg of water freezes?
inn [45]
You need an additional point of data here: the enthalpy of fusion, or conversely the enthalpy of melting (they differ only by their sign). For water (or ice) that value is gotten from sources such as the internet

<span>ΔH°(fus) = 6.01 kJ/mole </span>

<span>Since you have 35 000g, how many moles do you have? </span>
<span>Moles H2O = 35000 g/(18.015 g/mole) = 1942.8 moles</span>

<span>So, take that ΔH°(fus) in kJ/mole, multiply by the number of moles, and there ya go! 
</span>
6.01 x 1942.8 = 11,676 kJ of energy is released

Hope I helped!! xx
3 0
3 years ago
Water displacement is used to find what?<br><br><br><br>a. volume <br><br><br><br>b. density ​
Alex

Answer:

Volume

Explanation:

,,,,,,,,,,,,,,,,,,,

4 0
2 years ago
A 15kg projectile is moving with a velocity of 25m/s calculate its momentum
aliina [53]

The momentum of an object is given by:

p = mv

m is the object's mass and v is its velocity.

Given values:

m = 15kg

v = 25m/s

Plug in the values and solve for p:

p = 15*25

p = 375kg×m/s

8 0
3 years ago
Two bulbs are connected in parallel across a source of EMF = 8.0V with a negligible internal resistance. One bulb has a resistan
Sonja [21]
<h2>Answer:</h2>

(a) 3.18Ω

(b) 3.18Ω

<h2>Explanation:</h2>

Let the two bulbs be A and B

Given;

R_{A} = Resistance in bulb A = 3.0Ω

R_{B} = Resistance in bulb B = 2.5Ω

Since the two bulbs are connected in parallel;

i. their effective resistance (R_{X}) is given by

\frac{1}{R_{X}} = \frac{1}{R_{A} } + \frac{1}{R_{B} }  ---------------(i)

Substitute the values of R_{A} and R_{B} into equation (i)

=> \frac{1}{R_{X}} = \frac{1}{3.0} + \frac{1}{2.5}

Solve for  R_{X}

R_{X} = 1.36Ω

ii. voltage (potential difference), V, across them is the same;

Therefore we can get the total current (I) that will flow through them if the voltage to be supplied is 2.4V.

Use the Ohm's law;

V = I x R    -----------------(ii)

Where;

V = voltage across them = 2.4V

I = total current flowing through them

R = their effective resistance = R_{X} = 1.36Ω

Substitute these values into equation (ii) as follows;

2.4  = I x 1.36

I = 2.4 / 1.36

I = 1.76A

(a) Now get the value of R

Since the voltage across the two bulbs is 2.4V out of the 8.0V supplied by the source, then the remaining (8.0 - 2.4 = 5.6)V will pass across the resistor R.

Also, since the two bulbs make a series connection with the resistor R, the same total current (I = 1.76A) that flows through these bulbs will flow through the resistor R.

Therefore, to get the value of R, we use the relation

V = I x R   ------------------------------(iii)

Where;

V = voltage across the resistor = 5.6V

I = current through the resistor = 1.76A

<em>Substitute these values into equation (iii)</em>

=> 5.6 = 1.76 x R

=> R  = 5.6 / 1.76

=> R = 3.18Ω

Therefore, the value of R to be chosen in order to supply each bulb with a voltage of 2.4V is 3.18Ω

(b) The potential difference and voltage across refer to the same thing. Therefore, the value of R that would make the potential difference across each of the bulbs be 2.4V is the same as the one calculated in (a) which is 3.18Ω

3 0
3 years ago
6) The length of year is equal to the time it takes for one *
QveST [7]

Answer:

C: revolution of the Earth around the Sun

Explanation:

8 0
2 years ago
Other questions:
  • A 25.0-meter length of platinum wire with a cross-sectional area of 3.50 × 10^−6 meter^2 has a resistance
    8·1 answer
  • How would Newton's Three laws apply to a Ferris Wheel?
    10·1 answer
  • In a hospital setting, which of the following presents the possibility of being the source of an arc flash?
    9·1 answer
  • The sinking of dry air results in the formation of what terrestrial biome?
    9·1 answer
  • A 2.0-cm-thick bar of soap is floating on a water surface
    10·1 answer
  • The Thomson model of a hydrogen atom is a sphere of positive charge with an electron (a point charge) at its center. The total p
    9·1 answer
  • ERCRSOVOS - Table tennis footwork that is useful in this moment to cover a large distance quickly (SCRAMBLED)PE)
    5·1 answer
  • What is the potential energy of a 150 kg diver standing on a diving board that is 10 m high?
    5·2 answers
  • Why do teenagers often feel invincible, like nothing bad can happen to them
    14·1 answer
  • Which of the following affects the rate constant of a reaction?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!