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3 years ago

15

Which one of the following is a double-displacement reaction?

1 answer:

Free_Kalibri [48]3 years ago

5 0

I believe the correct answer from the choices listed above is option B. The double-displacement reaction would be HNO3 (aq) + KOH (aq) → H2O (l) + KNO3 (aq) . It <span> is a type of chemical </span>reaction<span> where two compounds </span>react<span>, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places</span>

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Leroy who has a mass of 100kg, is skateboarding at 9.0 m/s when he smacks into a brick wall and comes to a dead stop at 2.0 s

gtnhenbr [62]

F = m*a
a = v/t
a = 9.0 m/s / 2.0 s
a = 4.5 m/s^2
F = 100 kg * 4.5 m/s^2
F = 450 N
Sig figs = 500 N?

4 0

4 years ago

WILL MARK BRAINLEST What factual or logical statements would look like in ethics?

gulaghasi [49]

The intersection of logic and ethics concerns questions about the nature of moral reasoning. ... If one can successfully carry out such deductions, then moral reasoning is guided properly by consideration of nonmoral facts from which moral conclusions can be derived.

6 0

3 years ago

In this problem you will consider the balance of thermal energy radiated and absorbed by a person.Assume that the person is wear

Alekssandra [29.7K]

Answer:

The thermal power emitted by the body is $P_t = 286.8 \ Wm^{-2}$

The net power radiated is $P_{net} = 460 \ W$

Explanation:

From the question we are told that

The length of the assumed hum $T_{room} = 20 ^oC$ an body is L = 2.0 m

The circumference of the assumed human body is $C = 0.8 \ m$

The Stefan-Boltzmann constant is $\sigma = 5.67 * 10^{-8 } \ W\cdot m^{-2} \cdot K^{-4}.$

The temperature of skin $T_{body} = 30^oC$

The temperature of the room is

The emissivity is e=0.6

The thermal power radiated by the body is mathematically represented as

$P_t = e * \sigma * T_{body}^4$

substituting value

$P_t = 0.6 * 5.67*10^{-8} * (303)^4$

$P_t = 286.8 \ Wm^{-2}$

The net power radiated by the body is mathematically evaluated as

$P_{net} = P_t * A$

Where A is the surface area of the body which is mathematically evaluated as

$A = C* L$

substituting values

$A = 0.8 * 2$

$A = 1.6 m^2$

=> $P_{net} = 286.8 * 1.6$

=> $P_{net} = 460 \ W$

8 0

3 years ago

Which of the following statements are not true regarding sound?

Likurg_2 [28]

Answer:

All are not true.

Explanation:

Sound needs medium to travel.

sound speed is fastest in solids.

5 0

3 years ago

A rocket with total mass 3.00 3 105 kg leaves a launch pad at Cape Kennedy, moving vertically with an acceleration of 36.0 m/s2.

Simora [160]

Answer:

(b) 2.40 x $10^{3}$ kg/s

Explanation:

Given that: Total mass of the rocket = 3.003 x $10^{5}$ kg

acceleration of the rocket = 36.0 m $s^{-2}$

speed of the exhausted gases = 4.503 x $10^{3}$ m/s

Rate at which rocket was initially burning fuel = $\frac{mass}{time}$

But,

time = $\frac{velocity}{acceleration}$

= $\frac{4.503*10^{3} }{36.0}$

= 125.0833 s

So that;

Rate at which rocket was initially burning fuel = $\frac{3.003*10^{5} }{125.0833}$

= 2400.8001

= 2.40 x $10^{3}$ kg/s

Therefore, the initial rate at which the rocket burn fuel is 2.40 x $10^{3}$ kg/s.

6 0

3 years ago