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4 years ago

Please help with this assignment paper in science.

Physics

1 answer:

Fiesta28 [93]4 years ago

7 0

Explanation:

(a) The net force in the y direction is the sum of the individual forces. Taking up to be +y:

∑F = Lift − Weight

∑F = 100,000 N − 75,000 N

∑F = 25,000 N

(b) Since the net force is not 0, the forces are unbalanced.

(d) The net force in the x direction is the sum of the individual forces. Taking forward to be +x:

∑F = Thrust − Drag

∑F = 200,000 N − 23,000 N

∑F = 177,000 N

(e) Since the net force is not 0, the forces are unbalanced.

(f) Since the thrust is greater than the drag, the plane will accelerate.

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Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 15 cm apart. The sound

sineoko [7]

Answer:

100 cm

Explanation:

It is given that there are two loudspeakers that produces $\text{sound waves }$ along x-axis.

The maximum intensity of the sound is $\text{when the speakers are}$ at a distance of = 15 cm apart.

The sound intensity becomes zero when the separation between the speakers are increased and becomes 65 cm.

Therefore, the sound waves are in the phase, $\Delta x_1=15 \ cm$

The sound waves are out of phase when $\Delta x_2=65 \ cm$

Therefore,

$\Delta x_2 - \Delta x_1 = \frac{\lambda}{2}$

$\lambda= 2(\Delta x_2 - \Delta x_1)$

= 2 (65 - 15)

= 2 x 50

= 100 cm

Hence the wavelength of the sound is 100 cm.

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3 years ago

________ can exist without ________, but ________ cannot exist without ________.

Zolol [24]

B.
Voltage can exist without current, but current cannot exist without voltage.

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3 years ago

When does a skydiver achieve terminal velocity? when gravity equals air resistance when gravity is greater than air resistance w

ElenaW [278]

Answer:

when gravity equals air resistance

Explanation:

There are two forces acting on a skydiver falling down:

1) Gravity - this force acts downward, and it is constant during the whole fall, because its magnitude is given by

$F=mg$

where m is the mass of the skydiver and g the gravitational acceleration. Both quantities are constant, so the force of gravity is constant.

2) Air resistance - this force acts upward, and it is not constant: it is proportional to the velocity of the skydiver

$F=kv$

where k is a constant and v is the velocity. Therefore, as the skydiver falls down, its velocity increases and the air resistance increases as well.

The equation of forces for the skydiver is therefore:

$mg-kv=ma$

where a is the skydiver's acceleration. At the beginning of the fall, $mg>kv$ , so the skydiver accelerates towards the ground. However, as he accelerates, the air resistance $kv$ increases, till the moment at which air resistance becomes equal to gravity:

$mg=kv$

when this condition occurs, then the acceleration becomes zero, so the skydiver no longer accelerates and continues his fall at constant speed. This constant speed is called terminal velocity, and so it occurs when

gravity equals air resistance

3 0

3 years ago

Read 2 more answers

Se ha quemado magnesio (reacción con el oxígeno) y se obtuvieron 12g de óxido de magnesio (II). ¿Cuánto magnesio se quemó? ¿Qué

Sedaia [141]

Answer:

The first answer is 7,24g Mg

The second answer is 3,36L O2

Explanation:

Atomic masses: Mg= 24,3 ; O=16

Solution: MMgO = 40,3 g/mol

2 Mg + O2 => 2 MgO

1) 12 g MgO x (2x24,3 g Mg / 2x 40,3 MgO) = 7,24 g Mg

At first calculate moles from Oxygen:

12 g MgO x ( 1 mol from Oxygen/ 2 x 40,3 g MgO ) = 0,15 moles from Oxygen

then ....

0,15 moles from Oxygen x (22,4 lts / 1 mol from Oxygen ) = 3,36 lts

22.4 liters is the constant that we use in this equation, it is a value that is repeated since we are in the presence of a gas with ideal behavior, so it is considered that the normal molar volume of ideal gaseous substances is always 22.4 liters, estimated with a temperature of 0º C and a pressure of 1 atmosphere. (constant temperature and pressure)

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3 years ago

A non-reflective coating that has a thickness of 198 nm (n = 1.45) is deposited on top of a substrate of glass (n = 1.50). What

spin [16.1K]

Answer:

The wavelength is $\lambda_ 1 = 574.2 nm$