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ankoles [38]
2 years ago
6

Which phrase best describes a machine?

Physics
2 answers:
stepan [7]2 years ago
8 0

Answer:

option 1 will be the answer.

Explanation:

hope it helps.

Setler79 [48]2 years ago
8 0
I would say that a machine is a device/apparatus that uses mechanical power and has multiple parts.
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A student uses a compressed spring of force constant 22 N/m to shoot a 0.0075 kg eraser across a desk. The magnitude of the forc
muminat
The initial elastic potential energy stored in the spring is:
U= \frac{1}{2}k x^2 =  \frac{1}{2}(22 N/m)(0.035 m)^2=0.0135 J

Then, the spring is released, all this potential energy is converted into kinetic energy of the eraser:
U= K=0.0135 J

Then, the force of friction does a work to stop the eraser in this motion, and this work is equal to
W=Fd
where F is the magnitude of the friction force and d is the  distance covered by the eraser.

For energy conservation, the work  done by the friction force must be equal to the initial energy of the eraser, so:
K=W=Fd
and so we find d:
d= \frac{K}{F}= \frac{0.0135 J}{0.042 N}=0.32 m
3 0
3 years ago
What name is given to the variable we plot on the x-axis
erastova [34]

the answer you are looking for is the independent variable.

7 0
3 years ago
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Identify the reaction type for each generic chemical equation. A + B → AB: AB → A + B: Hydrocarbon + O2 → CO2 + H2O: AB + CD →
Ghella [55]

Answer:

1. A+B\rightarrow AB: Synthesis

AB\rightarrow A+B: Decomposition

Hydrocarbon+O_2\rightarrow CO_2+H_2O:  Combustion

4. AB+CD\rightarrow AD+CB : Double displacement

Explanation:

1. Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.

Example: Li_2O+CO_2\rightarrow Li_2CO_3  

2. Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

Example: Li_2CO_3\rightarrow Li_2O+CO_2

3. Combustion is a type of chemical reaction in which hydrocarbon is reacted with oxygen to form carbon dioxide and water.

Example:  

CH_4+2O_2 \rightarrow CO_2+2H_2O

4. Double displacement reaction is one in which exchange of ions take place.  

Example: NaOH+HCl\rightarrow NaCl+NH_2O

6 0
3 years ago
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You are standing 2.5 m directly in front of one of the two loudspeakers shown in the figure. they are 3.0 m apart and both are p
Mnenie [13.5K]
I'll just find out the path difference between the waves at the starting point. At infinity, the path difference will be zero because the observer will be infinitely far away from both. As the observer goes farther, the path difference keeps reducing till it reaches zero as the observer reaches infinity. 
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<span>Now to find wavelength. </span>
<span>Speed of sound in air at 20 degrees C = 343 m/s </span>
<span>Wavelength = 343 / 686 = 0.5 m </span>
<span>Destructive interference occurs when path difference = (2n + 1)λ/2 where n is an integer. </span>
<span>Maximum n possible can be found by, </span>
<span>(2n + 1)λ/2 < 1.405 </span>
<span>(2n + 1) < (1.4)(2) / (0.5) </span>
<span>2n < 5.6 - 1 </span>
<span>2n < 4.6 </span>
<span>n < 2.3 </span>
<span>So, we have 3 values of n, 0, 1 and 2. </span>
<span>Path differences are, λ/2, 3λ/2 and 5λ/2 which have values 0.25 m , 0.75 m and 1.25 m </span>
<span>But the question asks for distance from starting point. (sheesh!!) </span>
<span>Lets say the observer walked x distance. </span>
<span>Path difference = √((3)² + (2.5 + x)²) - (2.5 + x) </span>
<span>Equate this expression to the values obtained above to get the different values of x. </span>

5 0
3 years ago
50 N of force is exerted on a crate. It accelerates at a rate of 1.2 m/s/s. Calculate its mass
vitfil [10]

Answer:

m = F/a = 50 / 1.2 =  41.6666.... 42 kg

Explanation:

4 0
3 years ago
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