PHYSICS MIDDLE SCHOOL

The ________________ is the measure of how far the pendulum is offset (or pulled back) from a vertical position when it is released.A. Period
B.Amplitude
C. Pivot
D. Bob

Answers

Answer 1
Answer: B. Amplitude

It is the maximum distance from the equilibrium point of the pendulum.

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When traveling at top speed, a roller coaster train with a mass of12,000 kg has a velocity of 30 m/s. The kinetic energy of the train at top speed is

student built a simple heat engine that could lift masses. If the heat engine takes in 300 J of heat and loses 50 J to the environment, how much height will it lift a 1.5 kg mass?

Answers

Answer:

So it will lift the mass by h = 17 m

Explanation:

As per energy conservation we know that

Q_1 = W + Q_2

here we know that

Q_1 = 300 J

Q_2 = 50 J

now we have

W = 300 - 50

W = 250 J

so work done by the engine is 250 J

now we have

W = mgh

250 = 1.5 * 9.81 * h

h = 17 m

Which two of the following are the densest of the materials shown? Material Mass (g) Volume (L)

Rock 1000 0.5

Pillow 200 10

Bottle of soda 2000 2

Loaf of bread 100 1


rock and bottle of soda

loaf of bread and rock

loaf of bread and pillow

bottle of soda and loaf of bread

Answers

Explanation:

The density of the material is given by,

Density = (mass)/(Volume)

Case 1: Rock

Density = (mass)/(Volume)

Density = (1000)/(0.5)

Density = 2000 (g)/(L)

Case 2: Pillow

Density = (mass)/(Volume)

Density = (200)/(10)

Density = 20 (g)/(L)

Case 3: Bottle of Soda

Density = (mass)/(Volume)

Density = (2000)/(2)

Density = 1000 (g)/(L)

Case 4: Load of bread

Density = (mass)/(Volume)

Density = (100)/(1)

Density = 100 (g)/(L)

Thus, rock and bottle of soda has maximum density.

What causes a nebula to collapse into a dense mass?

Answers

the answer is Gravity.

  Irregularities in the density of the gas causes a net gravitational force

What is momentum of a 18.0 g bullet moving with a velocity of 400 m/s to the right.

Answers

Answer:7.2kgm/s

Explanation:

Answer:

7,200 g · m/s

Explanation:

Momentum formula:

p = mv

p = momentum

m = mass

v = velocity

p = (18)(400)

p = 7,200 g · m/s

**PLEASE QUICKLY **A circuit has a resistance of 250 and is powered by a 120 V batteryThe current in the circuit, to the nearest tenth, is
____А.

Answers

Answer:

Current, I = 0.48 A

Explanation:

We have,

Resistance of a circuit is 250 ohms

Voltage of the battery is 120 V

It is required to find the current flowing in the circuit. Let I is the electric current. Ohm's law is given by :

V=IR\n\nI=(V)/(R)\n\nI=(120)/(250)\n\nI=0.48\ A

So, the current in the circuit is 0.48 A.

A car accelerates at a rate of 3.0 m/s^2. If it’s initial speed is 8.0 m/s, how many seconds will it take the car to reach a final speed of 25.0 m/s? Please show work

Answers

vf= 25 m/s
vi= 8 m/s
a= 3.0 m/s^2
t=?
You can substitute these values into the big five kinematic equations.

vf=vi+at
25= 8+3t
3t=17
t=5.67 seconds
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