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deff fn [24]
3 years ago
10

A 0.0121-kg bullet is fired straight up at a falling wooden block that has a mass of 4.99 kg. The bullet has a speed of 898 m/s

when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision with the bullet occurs. As a result of the collision, the block (with the bullet in it) reverses direction, rises, and comes to a momentary halt at the top of the building. Find the time t.
Physics
1 answer:
aliya0001 [1]3 years ago
7 0

Answer:

t = 0.11 s

Explanation:

The motion is complete inelastic so the motion can be model using

mb * vb + mB * vB = ( mb + mB ) vf

mb = 0.0121 kg ,  mB = 4.99 kg ,  vb = 898 m / s , vB = 0

Replacing to find vf

0.0121 * 898 m / s + 4.99 kg * 0 = ( 0.0121 + 4.99) * vf

vf = 2.18 m / s

Now to find the time take the acceleration as a= g = 9.8 m /s²

t = mb * vb / a * (mb + 2 * mB)

t = [0.0121 kg * 898 m /s] / 9.8 * ( 0.0121 kg + 2*4.99)

t = 0.11 s

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An Airbus A320 jetliner has a takeoff mass of 75,000 kg. It reaches its takeoff speed of 82 m/s (180 mph) in 35 s. What is the t
timofeeve [1]

Answer:

175.5 kN

Explanation:

We find the acceleration of the Airbus A320 jetliner from,

a = (v - u)/t where u = initial velocity of jetliner = 0 m/s (since it starts from rest), v = final velocity of jetliner = 82 m/s and t = time for velocity change = 35 s

So a = (v - u)/t = (82 m/s - 0 m/s)/35 s = 82 m/s ÷ 35 s = 2.34 m/s²

Now, the thrust of the engines on the jetliner T = ma where m = mass of jetliner = 75,000 kg and a = acceleration of jetliner = 2.34 m/s²

T = ma

= 75,000 kg × 2.34 m/s²

= 175500 N

= 175.5 kN

8 0
3 years ago
A(n) ____________________ valve operates similarly to a direct-acting sequence valve except that it has an external pilot line t
katrin [286]

Answer:

A remote controlled (<em>or externally piloted) </em>sequence valve

Explanation:

First of all, a sequence valve  is a pressure-operated valve that opens at an adjustable set pressure.

Sequence valves can be internally piloted or externally piloted.

  • Internally piloted sequence valves are known as direct-acting sequence valve. This means that the pressure change they sense is from their main inlet valve.
  • Externally piloted sequence valves have a pilot line in which the pilot signal to open the valve is from a source other than the line feeding it.

External pilot-operated sequence valves can be used to open and allow flow when a remote operation reaches a certain predetermined pressure.

4 0
3 years ago
An effort of 200 N is used to lift a load of 800 N by using a lever. If the load is at a distance of 40 cm from the fulcrum then
Alchen [17]

The effort distance​ will be 160 cm.Applying the moment at the center as follows will provide the effort distance:

<h3 /><h3>What is the mechanical advantage?</h3>

Mechanical advantage is a measure of the ratio of output force to input force in a system, it is used to obtain the efficiency of forces in levers and pulleys.

Given data;

Effort,\rm F_e=00 N

Load,\rm P= 400 \ N

Distance from the fulcrum,\rm d=40 \ cm

The effort distance​ is found by applying the moment at the center as;

\rm F_e \times d= P \times  d' \\\\ 200 \  N \times d'=800 \ N \times 40 \ cm \\\\ d'=160 \ cm

Hence, the effort distance​ will be 160 cm

To learn more about the mechanical advantage refer to the link;

brainly.com/question/7638820

#SPJ1

7 0
2 years ago
If the area of a concrete slap weighing 300n is 400cm2 ,how much pressure can it apply when kept on the ground
aleksklad [387]

Answer:

7500 N/m²

Explanation:

From the question given above, the following data were obtained:

Force (F) = 300 N

Area (A) = 400 cm²

Pressure (P) =?

Next, we shall convert 400 cm² to m². This can be obtained as follow:

1×10⁴ cm² = 1 m²

Therefore,

400 cm² = 400 cm² × 1 m² / 1×10⁴ cm²

400 cm² = 0.04 m²

Finally, we shall determine the pressure. This can be obtained as follow:

Force (F) = 300 N

Area (A) = 0.04 m²

Pressure (P) =?

P = F/A

P = 300 / 0.04

P = 7500 N/m²

3 0
3 years ago
The amount of light energy absorbed by an object depends on what two factors?
IRISSAK [1]

Answer:

It depends on the electro-magnetic frequency of the light and object's nature of atoms.

8 0
3 years ago
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