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Delvig [45]
3 years ago
10

Combustion reactions are also ________ reactions. A. nuclear B. exothermic C. endothermic D. spontaneous

Physics
2 answers:
Roman55 [17]3 years ago
7 0
The answer is a hopefully I helped
sveta [45]3 years ago
5 0
I think is a) i hope this hlp
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The doctor writes a prescription for na heparin 20,000 units in 500 ml n.s. infuse over 8 hours. what is the flow rate in ml/hr?
Ne4ueva [31]
I think this type of equation could be conducted in simple division equation since it does not involve drop rate.

we know that there is 500 ml of substance and should be infused within 8 hours period.

So the flow rate in ml/hr would be: 

500/8 = 62.5 ml/hr                                                                                    
8 0
3 years ago
An ideal parallel plate capacitor with a cross-sectional area of 0.4 cm2 contains a dielectric with a dielectric constant of 4 a
Mrrafil [7]

Answer: 283.2\times 10^{-9}\ nC

Explanation:

Given

Cross-sectional area A=0.4\ cm^2

Dielectric constant k=4

Dielectric strength E=2\times 10^8\ V/m

Distance between capacitors d=5\ mm

Maximum charge that can be stored before dielectric breakdown is given by

\Rightarrow Q=CV\\\\\Rightarrow Q=\dfrac{k\epsilon_oA}{d}\cdot (Ed)\quad\quad [V=E\cdot d]\\\\\Rightarrow Q=k\epsilon_oAE\\\\\Rightarrow Q=4\times 8.85\times 10^{-12}\times 0.4\times 10^{-4}\times 2\times 10^8\\\\\Rightarrow Q=28.32\times 10^{-8}\\\\\Rightarrow Q=283.2\times 10^{-9}\ nC

4 0
3 years ago
Read 2 more answers
A 29.0-kg block is initially at rest on a horizontal surface. A horizontal force of 71.0 N is required to set the block in motio
Julli [10]

Answer:

(a) \mu_s=0.25

(b) \mu_k=0.20

Explanation:

According to Newton's second law:

\sum F_y:N=mg\\\sum F_x:F_a=F_f

Recall that the frictional force is related jointly with the coefficient of friction and normal force F_f=\mu N. Replacing in the above equation, we get the coefficient of friction:

F_a=\mu N=\mu mg\\\mu=\frac{F_a}{mg}

(a) The  coefficient of static friction is related with the force required to set the block in motion:

\mu_s=\frac{71N}{29kg*9.8\frac{m}{s^2}}\\\mu_s=0.25

(b) The  coefficient of kinetic friction is related with the force required to keep the block moving with constant speed:

\mu_k=\frac{56N}{29kg*9.8\frac{m}{s^2}}\\\mu_k=0.20

3 0
3 years ago
lab safety test Safety goggles and an apron must be worn when handling chemicals labeled corrosive because they:________.
Sunny_sXe [5.5K]

Answer:

The terms of biosafety in a laboratory require that the person must not have the eyes and skin exposed.

Explanation:

A corrosive substance is a substance that can damage a surface when they come into contact.

These substances represent a danger in people since they can burn the eyes, the skin, and the inside of the body since the inhalation of gases can burn the respiratory tract.

These chemical burns can be avoided by properly following the biosafety protocol that a laboratory requires the use of masks, goggles, gloves, and an apron or lab coat.

5 0
4 years ago
What is necessary for differentiation to occur in a planet?
Vesnalui [34]

Answer: A difference in properties between two interacting systems as explained below.

Explanation: Planetary differentiation is the process of separation of different parts of a planetary body as a result of their physical or chemical behavior.

Causes for Physical Differentiation:

1. Melting and crystallization of source rock.

2. Differences in densities

3. Thermal diffusion

4. Collision of large bodies

Chemical Differentiation accounts for differences in chemical compositions of different materials.

The differentiation, or organization, of the Earth into layers led to the formation of a core, a crust, and eventually continents. The light elements were driven from the interior to form an ocean and atmosphere.

3 0
3 years ago
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