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3 years ago

Which of these statements is true about endothermic reactions, but not about exothermic reactions?

Physics

2 answers:

marshall27 [118]3 years ago

6 0

Answer:

The reactants have less energy than the products.

Explanation:

i just finished the quiz

sashaice [31]3 years ago

4 0

I think the correct answer from the choices listed above is the second option. For endothermic reactions, the reactants have less energy than the products. Which would mean that energy should be added to the reaction for it to proceed. Hope this answers the question.

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It is not possible to accurately calculate instantaneous velocity.<br> TRUE<br> FALSE

Papessa [141]

False
we can calculate it at a specific time by taking the derivative of positive function, which gives us the functional form of instantaneous velocity v(t)

4 0

3 years ago

A 92-kg fullback moving south with a speed of 5.8 m/s is tackled by a 110-kg lineman running west with a speed of 3.6 m/s. Assum

MariettaO [177]

Answer:

The speed and direction of the two players immediately after the tackle are 3.3 m/s and 53.4° South of West

Explanation:

given information:

mass of fullback, $m_{x}$ = 92 kg

speed of full back, $v_{x}$ = 5.8 to south

mass of lineman, $m_{y}$ =110 kg

speed of lineman, $v_{y}$ = 3.6

according to conservation energy,

assume that the collision is perfectly inelastic, thus

initial momentum = final momentum

$P_{ix}$ = $P_{x}$ '

m₁v₁ = (m₁+m₂) $v_{x}$ '

$v_{x}$ ' = m₁v₁/(m₁+m₂)

= (92) (5.8)/(92+110)

= 2.64 m/s

$P_{iy}$ = $P_{y}$ '

m₂v₂ = (m₁+m₂) $v_{y}$ '

$v_{y}$ ' = m₁v₁/(m₁+m₂)

= (110) (3.6)/(92+110)

= 1.96 m/s

thus,

$v$ ' = √ $v_{x}$ '²+ $v_{y}$ '²

= 3.3 m/s

then, the direction of the two players is

θ = 90 - tan⁻¹( $v_{y}$ '/ $v_{x}$ ')

= 90 - tan⁻¹(1.96/2.64)

= 53.4° South of West

7 0

3 years ago

Why is it safe to watch an eclipse of the Moon but not an eclipse of the Sun

gavmur [86]

A solar eclipse occurs when the moon crosses in front of the Sun, blocking some or all of its rays. A lunar eclipse happens when the moon is directly behind the earth, blocking the moon from receiving light. The only light comes from the light on earth's reflected shadow.

You can look at a lunar eclipse because there is very little light or none at all. You can't look at a solar eclipse because you are looking directly at the sun unless it is complete. Before totality, only some of the Sun is blocked, causing your pupils dilate to let in more light. Since they do this, more of the Sun's rays can be let in to the eye, which effectively allows your eyes to burn.

Some doctors and eye care specialists say that after someone complains of blindness after looking at a solar eclipse unaided, they can see what the Sun and moon looked like at the time that they looked at it, as it is burned onto their retinas.

8 0

3 years ago

A box of oranges which weighs 83 N is being pushed across a horizontal floor. As it moves, it is slowing at a constant rate of 0

otez555 [7]

The given question is incomplete. The complete question is as follows.

A box of oranges which weighs 83 N is being pushed across a horizontal floor. As it moves, it is slowing at a constant rate of 0.90 m/s each second. The push force has a horizontal component of 20 N and a vertical component of 25 N downward. Calculate the coefficient of kinetic friction between the box and the floor.

Explanation:

The given data is as follows.

$F_{1}$ = 20 N, $F_{2}$ = 25 N, a = -0.9 $m/s^{2}$