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3 years ago

A ball is thrown upwards with an initial velocity of 25.o m/s, what is the velocity of the ball at 11.9 m from the ground?

Physics

1 answer:

mylen [45]3 years ago

5 0

Answer:

v2 = 19.79m/s

Explanation:

Okay, lets write down everything we have;

v1 = 25m/s [up]

v2 = ?

d = 11.9 [up]

a = 9.8 [down]

So the formula we will use is v2^2 = v1^2 + 2ad. We also have to make acceleration negative, so everything can have the same direction of up:

v2^2 = v1^2 + 2ad

v2^2 = (25)^2 + 2(-9.8)(11.9)

v2^2 = 625 - 233.24

v2^2 = 391.76

v2 = 19.79m/s

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What are some of the landforms rovers have found on Mars that show it was once an active place?

Schach [20]

Answer:

The Curiosity rover found that ancient Mars had the right chemistry to support living microbes. Curiosity found sulfur, nitrogen, oxygen, phosphorus and carbon-- key ingredients necessary for life--in the powder sample drilled from the "Sheepbed" mudstone in Yellowknife Bay.

Explanation:

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8 0

3 years ago

Read 2 more answers

What capacitor in series with a 100ω resistor and a 18. 0 mh inductor will give a resonance frequency of 1000 hz?

Black_prince [1.1K]

Capacitor in series with a 100Ω resistor and a 18.0 mH inductor will give a resonance frequency of 1000 Hz is 1.38F

Resonance Frequency of a combination of Series LCR circuit is the frequency at which resonance is achieved in a circuit.

Resonance Frequency of a combination of Series LCR circuit is given by:

f = 1 / 2π $\sqrt{LC\\$

where, f is the resonance Resonance Frequency of a combination of Series LCR circuit

L is the Inductance of the inductor

C is the capacitance of the capacitor

Given,

f = 1000Hz

L = 18.0 mH = 0.018H

R = 100Ω

C = ?

On substituting the values in the above-mentioned formula:

1000 = 1 / 2π $\sqrt{0.018C}$

2π $\sqrt{0.018C}$ = 0.001

On solving, C = 1.38 F

Hence, the capacitance of the given capacitor is 1.38F.

Learn more about Resonant frequency here, brainly.com/question/13040523

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5 0

2 years ago

When a potential difference of 10 V is placed across a certain solid cylindrical resistor, the current through it is 2 A. If the

Keith_Richards [23]

Answer:

New Resistance = 0.5556 ohm

Explanation:

Resistance = resistivity * length /area

Here since resistivity and length are constant, we only need to see how the resistance increases or decreases with change in area.

New Area = pi * (3*D)^2 / 4

Old Area = pi * D^2 / 4

The ratio of new area / old area is :

$\frac{New Area}{Old Area} = 9$

Since area increases 9 times, and it is inversely proportional to resistance:

Resistance decreases by 9 times.

So, old resistance = Voltage / Current = 10 / 2 = 5 ohm

New Resistance = 5 / 9 = 0.5556 ohm (decreases by 9 times)

8 0

3 years ago

A pulley system operates with 40% efficiency. if the work put in is 200 joules, how much useful work is produced?

QveST [7]

1. Efficiency is the measure of how efficient a process is. It is used to assess the ability of a process in avoiding waste energy, materials, money and time in doing a desirable output. It is calculated as;

Efficiency = useful energy ouput / total energy input

.40 = useful work / 200

useful work = 80 joules

8 0

4 years ago

Read 2 more answers

Glider A of mass 2.5 kg moves with speed 1.7 m/s on a horizontal rail without friction. It collides elastically with glider B of

omeli [17]

Answer:

The speed of glider A after the collision is 0 m/s

Explanation:

Hi there!

The two gliders collide elastically. That means that the kinetic energy and momentum of the system are conserved, i.e., they remain constant before and after the collision.

The momentum is calculated as follows:

p = m · v

Where:

p = momentum.

m = mass.

v = velocity.

The equation of kinetic energy is the following:

KE = 1/2 · m · v²

Where:

KE = kinetic energy.

m = mass.

v = velocity.

The momentum of the system is the sum of the momentum of each glider.

be:

mA = mass of glider A

mB = mass of glider B

vA = velocity of glider A before the collision.

vB = velocity of glider B before the collision.

vA´= velocity of glider A after the collision.

vB´= velocity of glider B after the collision.

The momentum of the system will be:

mA · vA + mB · vB = mA · vA´ + mB · vB´

Replacing with the given data:

2.5 kg · 1.7 m/s + 2.5 kg · 0 m/s = 2.5 kg · vA´ + 2.5 kg · vB´

divide both sides of the equation by 2.5 kg:

1.7 m/s = vA´ + vB´

1.7 m/s - vA´ = vB´

Using the conservation of the kinetic energy of the system we can find vA´:

1/2 · mA · vA² + 1/2 · mB · vB² = 1/2 · mA · vA´² + 1/2 · mB · (1.7 m/s - vA´)²

Let´s replace with the given data:

1/2 · 2.5 kg · (1.7 m/s)² + 0 = 1/2 · 2.5 kg · vA´² + 1/2 · 2.5 kg · (1.7 m/s - vA´)²

divide both sides of the equation by (1/2 · 2.5 kg):

(1.7 m/s)² = vA´² + (1.7 m/s - vA´)²

(1.7 m/s)² = vA´² + (1.7 m/s)² - 2· 1.7 m/s · vA´ + vA´²

0 = 2vA´² - 2· 1.7 m/s · vA´

0 = 2vA´(vA´ - 1.7 m/s)

vA´ = 0

vA´ - 1.7 m/s = 0

vA´ = 1.7 m/s

Since the velocity of the glider A after the collision can´t be the same as before the collision, the velocity of glider A after the collision is 0 m/s.

4 0

3 years ago