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3 years ago

Kennedy and Lilly are in science class. They are asked to prove that some forces are non-contact

Physics

1 answer:

Svetllana [295]3 years ago

4 0

Answer:1,3 and 5

Explanation:

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A student buys a plastic dart gun and tries to find the maximum horizontal range. The student shoots the gun straight up and it

ryzh [129]

Answer:

The value is $R_{max} = 33.54 \ m$

Explanation:

From the question we are told that

The total time of flight is $t = 3.7 \ s$

Generally from kinematic equation

$v = u - g * \frac{t}{2}$

So v is the velocity at maximum height and the value is v = 0 m/s

$0 = u - 9.8 * \frac{ 3.7}{2}$

=> $u = 18.13 \ m/s$

Here u is the initial velocity of the dart as it leaves that gun

Gnerally the horizontal range of the dart is mathematically represented as

$R = \frac{u ^2 sin 2\theta }{g}$

For maximum horizontal range the value of $\theta = 45^o$

$R_{max} = \frac{ 18.13 ^2 sin 2(45) }{9.8}$

=> $R_{max} = 33.54 \ m$

6 0

3 years ago

When the E string of a guitar (frequency 330 Hz) is plucked, the sound intensity decreases by a factor of 2 after 4 s. Determine

zloy xaker [14]

Answer:

$Q=50.3$

Explanation:

From the question we are told that:

Frequency $F=330Hz$

Sound intensity drop $I_d=2$

Time $T=4s$

Therefore

Sound intensity Ratio

$\frac{I}{I_x}=\frac{1}{2}$

Generally the equation for Sound intensity is mathematically given by

$\frac{I}{I_x}=e^{-4\ \=t}$

$\frac{1}{2}=e^{-4\ \=t}$

$\=t =5.8s$

Generally the equation for Quality Factor is mathematically given by

$Q=2 \pi\frac{E}{\triangle E}$

$Q=2 \pi\frac{E}{\frac{E}{2*4}}$

$Q=50.3$

4 0

3 years ago

Which of the following explains how electricity flows?

Yuri [45]

Electrons flow from the positive end of a source towards the negative end

7 0

3 years ago

If a 3-kg rock is thrown at a speed of 2 m/s in a gravity-free environment (presuming one could be found), then an unbalanced fo

Katarina [22]

Answer:

a. False

Explanation:

For an object to be moving at a constant velocity, a net force of 0 N would be required.

Newton's 1st Law of Motion states that an object will remain at rest unless acted upon by an unbalanced force, and an object will remain in motion unless acted upon by an unbalanced force.

Therefore, the unbalanced force of 6 N would not allow the rock to maintain its constant speed.

The answer to this question is A) False.

3 0

3 years ago

Read 2 more answers

The neurotransmitter acetylcholine:

tatuchka [14]

Explanation:

A. is chemically identical to heroin.

3 0

3 years ago