3 years ago

Fill In the Blank: In a physical change, the of a substance does not change. The only thing that changes is a .

1 answer:

4 0

In a physical change, the [chemical identity] of a substance does not change. The only thing that changes is the [state of the matter]

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A drag racing vehicle travels from 0 to 100mph north in 5 seconds. What is the acceleration

kap26 [50]

The acceleration of the car is $8.9 m/s^2$

Explanation:

The acceleration of an object is given by

$a=\frac{v-u}{t}$

where

v is the final velocity

u is the initial velocity

t is the time elapsed

Here we have to convert the initial and final velocity of the vehicle into SI units. So we have:

$u = 0$ is the initial velocity

$v=100 mph \cdot \frac{1609 m/mi}{3600 s/h}=44.7 m/s$ is the final velocity

t = 5 s is the time elapsed

Solving for a, we find the acceleration:

$a=\frac{44.7-0}{5}=8.9 m/s^2$

Learn more about acceleration:

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#LearnwithBrainly

5 0

4 years ago

A traveling wave has displacement given by y(x,t)=(2.0cm)×cos(2πx−4πt), where x is measured in cm and t in s. what is the speed

quester [9]

Answer:

v = 2 cm/s

Explanation:

The equation of the wave is

y(x,t) = (2.0cm)*cos(2π*x−4π*t)

Where,

x is measured in cm

t in s

A more general formula for this equation would be

y(x,t) = A*cos(k*x−ω*t)

Where,

A = amplitude.

k = the wavenumber

ω = the angular frequency

The velocity of the wave corresponds to

v = ω/k

v = 4π / 2π = 2 cm/s

v = 2 cm/s

8 0

3 years ago

As a wave travels through a medium, it displaces particles in a direction parallel to the motion of the wave. We can conclude th

IgorLugansk [536]

Im sure the answer to this question is c.

5 0

3 years ago

The power of a motorcycle is 150W and the time is 14s. What is the work?

Artyom0805 [142]

10.7 or round it up to 11

8 0

3 years ago

weeeeeb [17]

Answer:

v = 36.667 m/s

Explanation:

Knowing the rotational inertia as

Lₙ = 550 kg * m²

r = 1.0 m

m = 30.0 kg

To determine the minimum speed v must have when she grabs the bottom

Lₙ = I * ω

I = ¹/₂ * m * r²

I = ¹/₂ * 30.0 kg * 1.0² m

I = 15 kg * m²

Lₙ = I * ω ⇒ ω = Lₙ / I

ω = [ 550 kg * m² /s ] / ( 15 kg * m² )

ω = 36.667 rad /s

v = ω * r

v = 36.667 m/s

7 0

4 years ago