PHYSICS MIDDLE SCHOOL

A car goes 152 miles in 2 hours and 5 minutes. Calculate the car’s speed in units of m/s. 1 mi = 1600 m.

Answers

Answer 1
Answer:

Answer:

The speed of the car is 32.4m/s

Explanation:

1mi = 1600m

152mi = 243 200m

2hr 5min = 7200s + 300s

= 7500s

speed = distance/time

= 243200/7500

= 32.4m/s (3s.f)
Answer 2
Answer: Hope it helps :) !!!!!!

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Fifteen joules of heat are added to a cylinder with a piston. The system uses 7 joules of energy to raise the piston upward. By how much did the internal energy of the system increase?

Answers

Answer:

8 J

Explanation:

Heat = work + change in internal energy

Q = W + ΔU

15 J = 7 J + ΔU

ΔU = 8 J

Why does the speed of sound depend on air temperature?

Answers

A certain temperature can be thick so the speed may take longer to get to it's destination.
The speed of sound is dependent on how close together the molecules of the transmitting medium is.

after the car leaves the platform , gravity causes it to accelerate downward at a rate of 9.8 m/s2. what is the gravitational force on the car?

Answers


The gravitational force on the car is the force popularly known
as the car's "weight".  Its magnitude is

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Starting from rest, Christina experiences 24.5 m/s2 of acceleration to take off from an aircraft carrier for 5 seconds. How long does the runway need to be? Round to the nearest meter.

Answers

Answer:

The length of the runway to the nearest meter is 306 m.

Explanation:

Given:

Initial velocity of Christina is, u=0\ m/s(Rest)

Time taken is, t=5\ s

Acceleration experienced by Christina is, a=24.5\ m/s^2

The length of the runway is, d=?

Now, we use Newton's equation of motion that relates the distance, initial velocity, time and acceleration.

So, we have the following equation of motion:

d=ut+(1)/(2)at^2

Plug in all the given values and solve for 'd'. This gives,

d=0+(1)/(2)* 24.5* 5^2\n\nd=(1* 24.5* 25)/(2)\n\nd=(612.5)/(2)\n\nd=306.25\approx 306\ m(\textrm{Rounding to nearest meter})

Therefore, the length of the runway to the nearest meter is 306 m.

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Answers

The battery provides electrical energy to run an electric circuit

Given a force of 100 n and an acceleration of 10 m/s2 what is the mass

Answers

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100 newtons /  10 m/s/s = 10 kg

The mass is 10 kg
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