PHYSICS HIGH SCHOOL

A worker pulls horizontally on a crate across a rough horizontal surface, causing it to move forward with constant velocity. Force A is the force exerted by the worker and force B is the force of friction due to the surface. What is the relationship between A and B?A > B
A = B
A< B
It will not slow down, but continue moving at constant velocity.

Answers

Answer 1

Answer:

Answer:

$A = B$

Explanation:

A work pulls the crate by horizontal force on it

Now due to this applied force crate is moving horizontally with uniform speed

so we can say that the acceleration of the crate will be zero

now by Newton's II law we can say

$F_(net) = 0$

$F - F_f = 0$

so here we will have

$F_f = F$

here we know that applied force is A

so F = A

and friction force is B

$F_f = B$

so correct relation is

$A = B$

Answer 2

Answer: If an object is moving at a constant velocity ( That means a constant speed in a straight line. ) the net force acting on the object is zero, nothing. Why? It's motion is described by Newton's first law: An object at rest will remain at rest and an object in motion will remain in motion moving at constant velocity unless acted by an outside force.

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true or falsethe precision of calculated answers is limited by the least precise measurement used in the calculation

Answers

That's true, you can't get any more precise than what's measured to the least precision.

The charge on a gamma ray is ____.
a. 2
b. 1
c. 0
d. 2

Answers

So we want to know what charge do gamma particles have. Gamma particles are high energy electromagnetic radiation or in other words, gammy rays are high energy photons. Photons have no electrical charge so the charge of gamma rays is equal to zero. The correct answer is c. 0

Answer:

1) An unstable nucleus

c. emits energy when it decays

2)The charge on gamma ray is

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3) what particle is emitted in alpha radiation?

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- There you go loves :)

Phileas Fogg, the character who went around the world in 80 days, was very fussy about his bathwater temperature. It had to be exactly 38.0o C. You are his butler, and one morning while checking his bath temperature, you notice that it’s 42.0oC. You plan to cool the 100.0 kg of water to the desired temperature by adding an aluminum-duckie originally at freezer temperature (-24.0oC). Of what mass should the Al-duckie be? [Specific heat of Al = 0.900 J/(goC); density of water =1 .00 g/ml]. Assume that no heat is lost to the air

Answers

Answer:

The mass of the Al-duckie should be 30 kg.

Explanation:

We will use the first law of thermodynamics:

ΔU = m·Cv·ΔT

Since the specific heat of water is 4.185 J(gºC), the change in the water's internal energy would be:

ΔU = 100 kg · 4.185 J(gºC) · (42ºC - 38ºC) = 1674 KJ

Given that no heat is lost, all the internal energy that the water loses while cooling down will transfer to the duckie. So, if the duckie has ΔU = 1674 KJ and its final temperature is the desired 38 ºC, we can calculate its mass using the first law again:

$m=\frac{\Delta{U}}{Cv{\Delta{T}}}=(1674)/(0.9*[38-(-24)])=30Kg$

Ammonia is a weak base because produce ____ ion in solution?

Answers

ammonia is a weak base ( electrolyte) because ammonia reacts with water to produce ammonium and hydroxide ions. When hydroxide ion reacts with ammonium, it results to water and ammonia. it only proves that ammonia is rather a base because of its acceptance of hydrogen ion from water.

Ammonia is a weak base because it produces hydroxide (OH-) ions in solution.

Why is ammonia a weak acid?

Ammonia is a weak base because it produces hydroxide ions (OH-) in solution.

When ammonia dissolves in water, it accepts a proton from water, forming the ammonium ion (NH4+), and leaves hydroxide ions behind. This partial dissociation results in a small concentration of hydroxide ions, causing the solution to be slightly basic.

Unlike strong bases, which fully dissociate and release a large number of hydroxide ions, ammonia's limited ability to produce hydroxide ions makes it a weak base.

More on ammonia can be found here:brainly.com/question/29519032

#SPJ6

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Answers

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A dog walks 12 meters to the west and then 16 meters back to the east

Answers

Answer:

Explanation:

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4 meters east dude woot

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