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3 years ago

Could anyone help with question 7?

Physics

2 answers:

PIT_PIT [208]3 years ago

4 0

The only answer that can justify being a hypothesis is C.

Tresset [83]3 years ago

3 0

I think the answer would be c- crickets chirp more frequently as temperature increases

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An electron has a mass of 9.1x10-31 kg. What is

zloy xaker [14]

Answer:

3.185×10^-29 kgm/s

Explanation:

Momentum(p)=mass×velocity

=9.1×10^-31×3.5×10

=3.185×10^-29 kgm/s

4 0

3 years ago

A car traveling on a straight road at 15.0 meters per second accelerates uniformly to a speed of 21.0 meters per second in 12.0

oksano4ka [1.4K]

<h2>Option 3, 216 m is the correct answer.</h2>

Explanation:

We have initial velocity, u = 15 m/s

Time, t = 12 seconds

Final velocity, v = 21 m/s

We have equation of motion v = u + at

Substituting

21 = 15 + a x 12

a = 0.5 m/s²

Now we have equation of motion v² = u² + 2as

21² = 15² + 2 x 0.5 x s

s = 216 m

Displacement = 216 m

Option 3, 216 m is the correct answer.

8 0

3 years ago

A car is traveling south at a speed of 69 miles per hour and then begins traveling west but continues traveling at the same spee

alexandr1967 [171]

Velocity
Because velocity is speed with direction. In this scenario, the speed has not changed, but the direction did.

8 0

3 years ago

A 900-kg car cruising at a constant speed of 60 km/h is to accelerate to 100 km/h in 4 s. The additional power needed to achieve

kiruha [24]

To solve this problem we will apply the concepts related to power as a function of the change of energy with respect to time. But we will consider the energy in the body equivalent to kinetic energy. The change in said energy will be the difference between the two velocity data given by half of the mass. We will first convert the given units into an international system like this

Initial Velocity,

$V_i = 60km/h (\frac{1000m}{1km})(\frac{1h}{3600s})$

$V_i = 16.6667m/s$

Final Velocity,

$V_f = 100km/h (\frac{1000m}{1km})(\frac{1h}{3600s})$

$V_f = 27.7778m/s$

Now Power is defined as the change of Energy over the time,

$P = \frac{E}{t}$

But Energy is equal to Kinetic Energy,

$P = \frac{\frac{1}{2} m\Delta v^2}{t}$

$P = \frac{\frac{1}{2} m(v_f^2-v_i^2)}{t}$

Replacing,

$P = \frac{\frac{1}{2} (900)(27.7778^2-16.6667^2)}{4}$

$P = 56kW$

Therefore the correct answer is A.

8 0

3 years ago

Choose all the answers that apply. The continents _____. were once connected have always been in the same location are slowly dr

svetoff [14.1K]

Answer: the correct options are

- were once connected

- are slowly drifting

Explanation: The continent is the main land mass of the earth which includes the following:

- Asia, Africa, Europe, Australia, North America, South America, and Antarctica.

These continents were once connected forming a supercontinent called PANGAEA

during the late palaeozoic and early mesozoic eras, millions of years ago.

Alfred Wegener, who is a German meteorologist, in 1912 came up with a hypothesis that the continents are slowly drifting the earth. He called the movement continental drift.

The continents rest on massive slabs of rock called tectonic plates. The plates are always moving and interacting in a process called plate tectonics. In recent studies, through the science of plate tectonics, we where able to understand the mechanism through which continental drift occurs. The mechanism includes:

- processes of seafloor spreading,

- rift valley formation, and

- subduction (where heavier tectonic plates sink beneath lighter ones).

7 0

3 years ago