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3 years ago

An airplane flew from San Francisco to Washington, D.C. Approximately

Physics

1 answer:

Arada [10]3 years ago

5 0

Answer:

The solution is given below:

Explanation:

The computation of the speed is shown below

As we know that

Speed = distance ÷ time

where

distance is 2000 km

And, the time is 2.5 hours

SO, the speed is

= 2,000 ÷ 2.5

= 800 km/h

Now the distance would be the same i.e. 2,000 km

but the time is 2 hours

So, the speed is

= 2,000 km ÷ 2 hours

= 1,000 km/hr

The direction should be opposite to the first airplane

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fiasKO [112]

Answer:

Because the light only spears to part of the water so it would appear less deep

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3 years ago

Label the parts of the brain. medulla oblongata thalamus cerebrum cerebellum brain stem pons hypothalamus midbrain

Stella [2.4K]

Answer:

Medulla oblongata is lower part of brain.

Cerebrum and cerebellum are the upper hemispheres of the brain.

Explanation:

Cerebrum is the largest part of the brain and is composed of right and left hemispheres.

Cerebellum is the part of brain that lies inside the cerebellum.

Medulla Oblongata is lowest part of brain stem which is most vital part of the brain.

Thalamus is a small region of the brain located above the brain stem. Its main function is to transmit sensory signals to cerebral cortex.

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3 years ago

A 2.00-kg, frictionless block is attached to an ideal spring with force constant 300 N/mN/m. At t=0 t=0 the block has velocity -

slega [8]

Answer:

The amplitude of the spring is 32.6 cm.

Explanation:

It is given that,

Mass of the block, m = 2 kg

Force constant of the spring, k = 300 N/m

At t = 0, the velocity of the block, v = -4 m/s

Displacement of the block, x = 0.2 mm = 0.0002 m

We need to find the amplitude of the spring. We know that the velocity in terms of amplitude and the angular velocity is given by :

$v=\omega\sqrt{A^2-x^2}$

$\omega=\sqrt{\dfrac{k}{m}}$

$\omega=\sqrt{\dfrac{300}{2}}$

$\omega=12.24\ rad/s$

So, $\dfrac{v^2}{\omega^2}+x^2=A^2$

$\dfrac{(-4)^2}{(12.24)^2}+(0.0002)^2=A^2$

A = 0.326 m

A = 32.6 cm

So, the amplitude of the spring is 32.6 cm. Hence, this is the required solution.

4 0

3 years ago

Which statement is always true about objects which exert gravitational force on each other? (3 points)

kumpel [21]

Answer:

They have mass is always true.

8 0

3 years ago

1. Calcular la masa de mercurio que pasó de 30 °C hasta 120 °C y absorbió 4400 cal. Calor específico del

timofeeve [1]

Answer:

Masa, m = 0.088 kg

Explanation:

Given the following data;

Temperatura inicial = 30°C

Temperatura final = 120°C

Capacidad calorífica específica = 138J/kg.K

Calor absorbido, Q = 4400 cal.

Para encontrar la masa;

La capacidad calorífica viene dada por la fórmula;

$Q = mct$

Dónde;

Q representa la capacidad calorífica o la cantidad de calor.

m representa la masa de un objeto.

c representa la capacidad calorífica específica del agua.

dt representa el cambio de temperatura.

dt = T2 - T1

dt = 120 - 30

dt = 90°C to kelvin = 273 + 90 = 363K

Sustituyendo en la fórmula, tenemos;

$4400 = m*138*363$

$4400 = 50094m$

$m = \frac {4400}{50094}$

Masa, m = 0.088 kg

7 0

3 years ago