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3 years ago

Which of these objects could be falling with constant acceleration?

Physics

1 answer:

LuckyWell [14K]3 years ago

5 0

Answer:

1 and 2

Explanation:

If an object has constant acceleration, it's displacement at time t is:

Δx = v₀ t + ½ at²

For object 1:

0.44 = (0) (0.3) + ½ a (0.3)²

a = 9.78

3.14 = (0) (0.8) + ½ a (0.8)²

a = 9.81

So object 1's acceleration is approximately constant.

For object 2:

0.06 = (0) (0.3) + ½ a (0.3)²

a = 1.33

3.09 = (0) (2.1) + ½ a (2.1)²

a = 1.40

So object 2's acceleration is approximately constant.

For object 3:

0.44 = (0) (0.3) + ½ a (0.3)²

a = 9.78

3.09 = (0) (2.1) + ½ a (2.1)²

a = 1.40

So object 3's acceleration is not constant.

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When there is an electric force acting on an object, the direction in which an object may accelerate has to do with

noname [10]

Answer:

When an external non-zero net force acts on an object, the object accelerates in the direction of the net force. The magnitude of the acceleration is directly proportional to the magnitude of the net force and inversely proportional to the mass of the object

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3 years ago

A Formula One race car with mass 770.0 kg is speeding through a course in Monaco and enters a circular turn at 235.0 km/h in the

Marat540 [252]

Answer:

Explanation:

Given

mass of first car $m_1=770 kg$

speed $=235 km/h\approx 65.27 m/s$

radius of first turn=125 m

And Angular momentum is given by =mvr

Angular momentum of first car

$L_1=770\times 65.27\times 125=6282,237.5 N-m/s$

$v_2=190\approx 52.77 m/s$

$r_2=100m$

similarly $L_2=770\times 52.77\times 100=4063290 N-m/s$

$\frac{L_1}{L_2}=\frac{r_1v_1}{r_2v_2}=\frac{125\times 65.27}{100\times 52.77}=1.546$

Thus angular momentum of first car is 1.54 times of second one

4 0

3 years ago

9. Name an object that has a great mass but has a small volume

larisa [96]

ANY DENSE OBJECT

A mathematical equation for density is: Density = mass/volume or D = m/v. If something has a large mass compared to its volume, it has a high density. This is like a set of weights which can be small but heavy. But if an object has a small mass compared to its volume it has a lower density.

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3 years ago

Inertia ____.

OlgaM077 [116]

The correct answer is (c.) resists a change in motion of an object. Inertia basically resists any physical changes in an object in terms of its state. As stated in the Newton's first law of motion or also known as law of inertia, an object that is at rest will stay at rest and an object that is in motion will stay in motion. In short, an object will keep doing what it is already doing UNLESS net force is acted upon it,

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4 years ago

Which term defines the amount of mechanical work an engine can do per unit of heat energy it uses? A. specific heat B. conductiv

KengaRu [80]

Answer:

Efficiency

Explanation:

The amount of mechanical work an engine can do per unit of heat energy it uses is called its efficiency.
It is also defined as the output divided by the total electrical power consumed.
In terms of heat, efficiency of engine is given by :

$\eta=1-\dfrac{Q_o}{Q_i}$

$Q_o\ and\ Q_i$ are output heat and input heat respectively.

Hence, the correct option is (d) "efficiency"

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3 years ago