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3 years ago

The forces exerted on an object are shown. (3 points)

Physics

1 answer:

Alex_Xolod [135]3 years ago

7 0

Answer:

<em>F equals 3 N and the object remains stationary</em>. (second option in the list)

Explanation:

For sure to cancel acting forces, F must be 3N pointing up. But with regards to the object stationary or not, the question is tricky. We could have a ZERO net force applied, and the object moving at constant speed, which could still verify Newton's Laws. But considering the first answer option that refers to vertical motion upward where the object could be gaining potential energy, the most accurate response is that the force F has to be 3 N pointing up to make the object in equilibrium, and no motion in the vertical axis.

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ANSWERED: An object with a massive 5 kg is thrown with an initial velocity of 6 m/s. If the object has an initial height of 10 m

vodka [1.7K]

Explanation:

The velocity is not needed. (its needed to find kinetic energy but its irrelevant to the question)

Potential energy = Mgh

Mass=5kg, height=10meters, g=9.8

P.e=5×9.8×10

=5×98

=490 joules

Hope it helps

4 0

3 years ago

There is a 247–m–high cliff at Half Dome in Yosemite National Park in California. Suppose a boulder breaks loose from the top of

Cerrena [4.2K]

Answer:

Vf = 69.61 m/s

Explanation:

We will use the third equation of motion to solve this problem:

$2gh = V_{f}^2 - V_{i}^2\\$

where,

g = acceleration due to gravity = 9.81 m/s²

h = height of cliff = 247 m

Vf = final velocity = ?

Vi = initial velocity = 0 m/s (boulder breaks loose from rest)

Therefore,

$(2)(9.81\ m/s^2)(247\ m) = V_{f}^2 - (0\ m/s)^2\\V_{f} = \sqrt{4846.14\ m^2/s^2}\\$

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3 years ago

A person runs up several flights of stairs and is exhausted at the top. Later the same person walks up the same stairs and does

KIM [24]

Answer:

Explanation:

Work done by the person depends on its mass and the height raised. It also depends on the acceleration due to gravity.

As the height raised and the mass of person is same. The value of acceleration due to gravity is also constant So, the work done is also same in both the cases.

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3 years ago

Investigator Campbell has bullets that were collected from the crime scene and puts them under her comparison microscope. What o

fgiga [73]

Answer:

Test bullets fired from the suspected gun

Explanation:

This is the correct answer!! I took the test!!

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3 years ago

An isolated conducting sphere has a 12 cm radius. One wire carries a current of 1.0000049 A into it while another wire carries a

tatuchka [14]

Answer:

it will take for the sphere to increase in potential by 1500 V, 503.71 s.

Explanation:

The charge on the sphere after t seconds is:

q = (1.0000049 - 1.0000000) t = 0.0000049 t

The voltage on the surface is

V = k * $\frac{q}{R}$ = k 0.0000049 t / R

solve for t

t = (R*V) / (0.0000049 k) = (0.12 * 1500) / (0.0000049 * $9e^{9}$ ) = 503.71 s

7 0

4 years ago