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4 years ago

g A change in the initial _____ of a projectile changes the range and maximum height of the projectile.

Physics

1 answer:

docker41 [41]4 years ago

7 0

Answer:

Velocity.

Explanation:

Projectile motion is characterized as the motion that an object undergoes when it is thrown into the air and it is only exposed to acceleration due to gravity.

As per the question, 'any change in the initial velocity of the projectile(object having gravity as the only force) would lead to a change in the range as well as the maximum height of the projectile.' To illustrate numerically:

Horizontal range: As per expression:

R= ( $u^{2}$ *sin2θ)/g

the range depending on the square of the initial velocity.

Maximum height: As per expression:

H= ( $u^{2}$ * $sin^{2}$ θ )/2g

the maximum distance also depends upon square of the initial velocity.

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The answer is 84N, but what is the mass and weight calculation?

Monica [59]

Answer:

weight= density ×volume× 9.8

mass=density×volume

Explanation:

$weight = 0.12 \times 0.04 \times 0.04 \times 3.14 \times 13600 \\ \times 9.8 = 80.351 \: n \\ \\ mass = 0.12 \times 0.04 \times 0.4 \times 3.14 \times 13600 = \\ = 8.199 \: kg$

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3 years ago

Which would show an example of how physical changes are reversible? cutting a gold bar in two pieces and then putting the pieces

arlik [135]

Melting tin and then cooling it into a mold is an example of reversible physical changes.

Explanation:

When an object undergoes a change in size, state, or shape and not in their chemical compositions referred to as physical change. But chemical change occurs as a result of the change in substances composition. It also forms a new one by the combination/ breakage of one or more objects.

In the case of making gold cube into two pieces, there is no possibility of getting the original state again even the physical change happens. Match burning and relighting and sodium plus chlorine forming table salt show chemical change. But in tin melting and cooling it to form mold is the physical change i.e changes in state(liquid to solid) and are reversible too.

6 0

3 years ago

Read 2 more answers

3. A 20 kg lawnmower is pushed by its handle, which makes a 40 degree angle with the horizontal. What

Mkey [24]

13788 J is required to finish the work.

Explanation:

Given that,

Mass of lawnmower is 20 kg

Force = 30 N

$\text { Angle }(\theta)=40^{\circ}$

Displacement ( distance moved )= 20m

The force of 30N is applied along the direction of motion and was applied for the whole 20 m.

The formula of work done for one pass is

$\text { Work done }=\text { force } \times \text { displacement } \times \cos \theta$

Substituting the given data into the formula,

$W=30 \times 20 \times \cos 40^{\circ}$

$\mathrm{W}=600 \times \cos 40^{\circ}$

$\mathrm{W}=600 \times 0.766$

W = 459.6 J

Work done for one pass = 459.6J

Now, work done for 30 passes is calculated by multiplying the work done for one pass into 30.

$\text { Then the work done for } 30 \text { passes is } 459.61 \times 30=13788 \mathrm{J}$

Work is done by the person pushing the mower to finish the work is 13788 J.

5 0

3 years ago

The peak current through a resistor is 2. 0 aa. part a what is the peak current if the resistance rr is doubled?

timofeeve [1]

When the resistance R is doubled, I = 1 A

One of the most fundamental and significant principles controlling electrical and electronic circuits is called Ohm's Law. For a linear device, it relates current, voltage, and resistance.

According to Ohm's Law, the current flowing through a circuit is inversely proportional to the resistance in the circuit and directly proportional to the applied potential difference.

Ohm's law can be written mathematically as follows:

V = IR

Where:

V = voltage expressed in Volts

I = current expressed in Amps

R = resistance expressed in Ohms

If any two quantities are known, the third can be computed by manipulating the formula.

I= V/R

R= V/I

To know more about Ohm's law refer:

brainly.com/question/796939

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2 years ago

A scene in a movie has a stuntman falling through a floor onto a bed in the room below. The plan is to have the actor fall on hi

tekilochka [14]

Answer:

The maximum mass that can fall on the mattress without exceeding the maximum compression distance is 16.6 kg

Explanation:

Hi there!

Due to conservation of energy, the potential energy (PE) of the mass at a height of 3.32 m will be transformed into elastic potential energy (EPE) when it falls on the mattress:

PE = EPE

m · g · h = 1/2 k · x²

Where:

m = mass.

g = acceleration due to gravity.

h = height.

k = spring constant.

x = compression distance

The maximum compression distance is 0.1289 m, then, the maximum elastic potential energy will be the following:

EPE =1/2 k · x²

EPE = 1/2 · 65144 N/m · (0.1289 m)² = 541.2 J

Then, using the equation of gravitational potential energy:

PE = m · g · h = 541.2 J

m = 541.2 J/ g · h

m = 541.2 kg · m²/s² / (9.8 m/s² · 3.32 m)

m = 16.6 kg

The maximum mass that can fall on the mattress without exceeding the maximum compression distance is 16.6 kg.

6 0

3 years ago

g A change in the initial _____ of a projectile changes the range and maximum height of the projectile.​

g A change in the initial _____ of a projectile changes the range and maximum height of the projectile.