If the truck has a mass of 2,000 kilograms, what is its momentum? Express your answer in kg·m/sec.

Answers

Answer 1

Answer: You don't tell us its speed. If that's the full question and there is no indication of a speed, the answer is 0kg.m/s as it has no momentum

Answer 2

Answer:
Wait but u don't mention speed, so there's no momentum

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How can we run out of energy if energy cannot be created or destroyed?

Answers

Excellent question !
When people say "run out of energy", what they really mean is: run out of the easiest substances to get energy FROM ... coal, oil, and wood.

you don't run out of energy, you run out of USABLE energy. That may or may not happen, if humans somehow manage to become a type two civilization, it's almost never happening, because if a civilization becomes type two, they can harvest all of the energy produced by their sun. And if the human civilization becomes a type two, they're going to become type 3 well before the sun runs out of gases. If we become a type 3, we can use all energy from every part of the universe.

A current carrying wire wrapped around an iron ore is called a

Answers

I'm pretty sure that you're talking about an "electromagnet",
and that you actually meant an iron core .

The efficiency of the wedge is low because of _____.width
friction
length
height

Answers

The efficiency of the wedge is low because of friction. The amount of work it supplies is small compared to the amount of work output. The internal resistance of the wedge is incredibly high due to its heavy weight at the other end of the blade.

Answer:

is friction [B}

Explanation:

A heater with an effective resistance of 4.8 ohms is connected to 240.0 volts if it operated approximately 25% of the time and electricity costs $0.10 per kWh what will be the electrical bill for30 days

Answers

-- Power used when the heater is running =

   V²/R = (240)²/4.8= 12,000 watts. (12 KW)

(A gigantic heater ... suitable for maybe a theater, not for a home.)

-- Energy consumed in one day:

   (12 KW) x (24 hours) x (25%) = 72 KwH per day

-- Energy consumed in 30 days: (72 KwH/day) x (30 days) =

      2,160 KwH in 30 days

-- Cost = ($0.1 / KwH) x (2,160 KwH) = $216.00 in 30 days

a 0.4 kg block rests on a desk. the coefficient of static friction is 0.2. You push the side of the block but do not have a spring scale to measure the force you use. the block does not move. which statement is true about the force of static friction?

Answers

Answer:

D. It is no smaller than $0.78N$

Explanation:

The question is incomplete. These are all the options :

A. It is no larger than $0.78N$

B. It is $0.78N$

C. It is $0.08N$

D. It is no smaller than $0.78N$

To solve this problem, we have the data of :

$m=0.4kg$

Where ''m'' is the mass of the block

μ = 0.2

Where ''μ'' is the coefficient of static friction

If we want to find the magnitude of the force of static friction we need to use the following equation :

$F_(sf)=$ μ. $F_(N)$ (I)

Where '' $F_(N)$ '' is the normal force that the desk exerts on the block. Its magnitude is equal to the weight (because we suppose that the block rests horizontally on the desk).

The weight '' $W$ '' can be calculated as :

$W=m.g$

Where ''m'' is the mass and ''g'' is the acceleration due to gravity.

The value of ''g'' is

$g=9.81(m)/(s^(2))$

The weight of the block is

$W=(0.4kg).(9.81(m)/(s^(2)))$

$W=3.924N$

Now, the weight is equal to the normal force ⇒

$W=F_(N)=3.924N$

Using the equation (I) :

$F_(sf)=(0.2).(3.924N)$

$F_(sf)=0.7848N$

The correct option is D. It is no smaller than $0.78N$

Static friction is greater than Applied force

A 12.0 kg bucket is lowered vertically by a rope in which there is 163 N tension at any given instant. What is the acceleration of the bucket? Is it accelerating up or down? Denote the acceleration in m/s2 where up is positive and down is negative.

Answers

Answer:

The acceleration of the bucket is 3.77m / S ^ 2 up

Explanation:

Hello,

To solve this exercise we must initially draw the free-body diagram (see attached image) of the bucket, and identify the forces present in this case would be the tension force of the rope and the weight of the bucket.

Then use Newton's law that states that the sum of the forces in a body is equal to mass per accession. We will assume that up is positive and down is negative

T=tension=163N

m=mass of bucket =12kg

g=gravity=9.81m/S^2

T-mg=m(a)

$(T-mg)/(m) =a\n(163N-(12kg)(9.81m/S^2)/(12)=3.77m/s^2$

The acceleration of the bucket is 3.77m / S ^ 2 up

Final answer:

The weight of the bucket is 117.6 N. As the tension in the rope is 163 N, which is greater than the weight of the bucket, this means the bucket is accelerating upwards. The acceleration of the bucket, calculated using Newton's Second Law, is 3.78 m/s².

Explanation:

To answer this question, we need to understand the concept of tension and how it relates to the weight of an object and its acceleration according to Newton's Second Law. The tension in the rope (T) equals 163 N, and the weight of the bucket (W) equals its mass (12.0 kg) times acceleration due to gravity (9.8 m/s²), so W = (12.0 kg) (9.8 m/s²) = 117.6 N.

Since the tension is greater than the weight, it means the bucket is accelerating upwards. To calculate the acceleration, we subtract the weight from the tension and divide by the mass. This leaves us with a = (T - W) / m = (163 N - 117.6 N) / 12.0 kg = 3.78 m/s² (upwards, hence positive).

Learn more about Acceleration due to Tension here:

brainly.com/question/34161316

#SPJ3

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