Substances in a mixture keep their own properties. True False

The speed limit on some interstate highways is roughly 80 km/h. What is this in meters per second? How many miles per hour is th

sergey [27]

Answer:

1) Speed in m/s equals 22.22 m/s.

2) Speed in miles per hour equals 49.712 mph.

Explanation:

Since we know that in 1 kilometer there are 1000 meters and in 1 hour there are 3600 seconds hence we can write

$80km/h=\frac{80\times 1000m}{3600s}=22.22m/s$

Now we know that 1 mile equals 1.609 kilometer hence we conclude that 1 kilometer equals $\frac{1}{1.609}=0.6214$ mile

Hence

$80km/h=\frac{80\times 0.6214miles}{1h}=49.712mph$

3 0

3 years ago

Name the component that the resistance decreases as the current increases.

yarga [219]

Answer:

LDRs and thermistors

Light dependent resistors or LDRs are made of semiconductor material. Their resistance decreases as the light intensity increases. ... Their resistance decreases as the temperature increases.

3 0

2 years ago

If an astronaut could travel a v 0.980c for at time oft 12.0 hr as measured on Earth, how much time would the astronauts measure

bonufazy [111]

Answer:

Time observed by the astronaut = 2.388 hours

Distance traveled be according to an observer on Earth = 1.27 × 10¹¹ m

Distance traveled according to the astronaut = 2.52 × 10¹² m

Explanation:

Given:

Speed of the astronaut, v = 0.980c

time = 12.0 hr

now, from the time dilation formula we have

$t'=t\times\sqrt{1-\frac{v^2}{c^2}}$

here

t' is the time observed by the astronaut

c is the speed of the light = 3 × 10⁸ m/s

thus,

$t'=12\times\sqrt{1-\frac{(0.980c)^2}{c^2}}$

or

t' = 2.388 hours

Now,

Distance = Velocity × time

The distance traveled be according to an observer on Earth will be

Distance = 0.980c × ( 12 × 60 × 60 )

or

D = 0.980 × 3 × 10⁸ × ( 12 × 60 × 60 )

or

Distance = 1.27 × 10¹¹ m

And, The distance traveled according to the astronaut will be

Distance = velocity × t'

or

D = 0.980 × 3 × 10⁸ × ( 2.388 × 60 × 60 )

or

Distance = 2.52 × 10¹² m

5 0

3 years ago

My mom and I walked 3,600 m in 90 minutes. What was our speed in m/min?

PtichkaEL [24]

Fill in the fraction: 3,600/90 = 40; turn it into a unit fraction.

40 mi/min

3 0

2 years ago

A 16.0 kg canoe moving to the left at 12.5 m/s makes an elastic head on collision with a 14.0 kg raft moving to the right at 16.

juin [17]

A 16.0 kg canoe moving to the left at 12.5 m/s makes an elastic head on collision with a 14.0 kg raft moving to the right at 16.0 m/s.
After the collision the raft moves to the left at 14.4 m/s assuming water simulates a frictionless surface.
Mass of the canoe (m1) = 16 Kg
Mass of the raft (m2) = 14 Kg
Initial velocity of the canoe (u1) = 12.5 m/s
Initial velocity of the raft (u1) = - 16 m/s [Here, the raft's velocity is negative, because the objects are moving in the opposite direction]
Total momentum of the system = m1u1 + m2u2 = [(16 × 12.5) + (14 × -16)] Kg m/s = (200 - 224) Kg m/s = -24 Kg m/s
Final velocity of the raft (v2) = 14.4 m/s
Let the final velocity of the canoe be v1.
Total momentum of the system after the impact = m1v1 + m2v2 = [(16 × v1) + (14 × 14.4)] Kg m/s = 16v1 Kg + 201.6 Kg m/s
According to the law of conservation of momentum, Total momentum of the system before the impact = Total momentum of the system after the impact
or, -24 Kg m/s = 16v1 Kg + 201.6 Kg m/s
or, -24 Kg m/s - 201.6 Kg m/s = 16v1 Kg
or, -225.6 Kg m/s = 16v1 Kg
or, v1 = -225.6 Kg m/s ÷ 16 Kg
or, v1 = -14.1 m/s

Answer:

The final velocity of the canoe is -14.1 m/s or 14.1 m/s to the right.

Hope you could get an idea from here.

Doubt clarification - use comment section.

6 0

2 years ago