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3 years ago

Substances in a mixture keep their own properties. True False

Physics

1 answer:

ra1l [238]3 years ago

3 0

That is true. They aren't undergoing a chemical change. They are still the same.

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A car is moving at a velocity of 25 km/h and increases velocity to 1200 km/h in 2 min. what is the acceleration?

OlgaM077 [116]

Answer:

a = 2.72 [m/s2]

Explanation:

To solve this problem we must use the following kinematics equation:

$v_{f} =v_{o} + a*t$

where:

Vf = final velocity = 1200 [km/h]

Vo = initial velocity = 25 [km/h]

t = time = 2 [min] = 2/60 = 0.0333 [h]

1200 = 25 + (a*0.0333)

a = 35250.35 [km/h2]

if we convert these units to units of meters per second squared

$35250.35[\frac{km}{h^{2} }]*(\frac{1}{3600^{2} })*[\frac{h^{2} }{s^{2} } ]*(\frac{1000}{1} )*[\frac{m}{km} ] = 2.72 [\frac{m}{s^{2} } ]$

3 0

3 years ago

Use the drop-down menus to complete the sentences. A is a seasonal wind___that blows in the opposite direction of normal winds.

Mrac [35]

The following sentences are completed and explained below

Explanation:

A is a seasonal wind known as monsoon wind that blows in the opposite direction of normal winds.

Prevailing winds are the wind that blows mainly from a single general direction.

Seasonal winds that blow in the opposite direction of normal winds often cause drought in the winter.

The monsoon winds are seasonal winds that refers to wind systems that have a pronounced seasonal reversal of direction.

The winds that blow from single direction over a specific area of the earth is known as prevailing winds.

6 0

4 years ago

Read 2 more answers

A 27.0 g marble sliding to the right at 56.8 cm/s overtakes and collides elastically with a 13.5 g marble moving in the same dir

Nataly [62]

Answer: $v_1=28.4 cm/s$

Explanation:

Given

mass of marble $m_1=27 gm$

velocity of marble $u_1=56.8 cm/s \approx 0.568 m/s$

mass of second marble $m_2=13.5 gm$

Velocity of second marble $u_2=14.2 cm/s \approx 0.142 m/s$

After collision 13.5 gm marble moves to the right at i.e. $v_2=71 cm/s$

Conserving momentum

$m_1u_1+m_2u_2=m_1v_1+m_2v_2$

$27\times 56.8+13.5\times 14.2=27\times v_1+13.5\times 71$

$1533.6+191.7=27\cdot v_1+958.5$

$27\cdot v_1=766.8$

$v_1=\frac{766.8}{27}=28.4 cm/s$

7 0

3 years ago

If the wavelength of a wave stays the same and the speed doubles, what happens to the frequency of the wave?

Lapatulllka [165]

Explanation:

velocity = wavelength × frequency => v= f1 × λ => f1 = v/ λ

λ = stays the same

v = doubles

2v = f2 × λ

2v/λ = f2

now ,

f2/f1= 2vλ/ vλ = 2

f2 = 2f1

therefore frequency is doubled

7 0

3 years ago

A runner is training for an upcoming marathon by running around a 80-m-diameter circular track at constant speed. Let a coordina

Umnica [9.8K]

Answer:

Explanation:

Given

diameter $d=80\ m$

runner start at (x,y)=(48 m,0 m)

Runner runs around the circle 2.5 times

i.e. he runs two and half rounds

displacement of two rounds is zero so net displacement is of half round

displacement $=\pi \cdot 48=150.816\ m$

After 2.5 round he will be towards west direction with respect to origin

so direction of displacement vector is west

7 0

4 years ago