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ivanzaharov [21]
3 years ago
10

 A hotdog cannon shoots a hotdog straight up in the air with an initial velocity of 30 m/s. How high will the hotdog fly?

Physics
1 answer:
Yuri [45]3 years ago
7 0

At its peak height, the hotdog will have no vertical velocity, so that

{v_f}^2-{v_i}^2=2(-g)\Delta y\implies-\left(30\,\dfrac{\mathrm m}{\mathrm s}\right)^2=2\left(-9.8\,\dfrac{\mathrm m}{\mathrm s^2}\right)y_{\mathrm{max}}

\implies y_{\mathrm{max}}=46\,\mathrm m

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Please explain how to solve it!!!
Alexxandr [17]
All you need to do is to convert the velocity to meters per hour. Then multiply by 0.4 hours. I guess the answer was rounded up.
6 0
3 years ago
Jenny wants to determine if a new brand name washing detergent is better than her old detergent she washed ten dirty t-shirts wi
katovenus [111]

Answer:


Independent variable: washer detergent

Dependent varaible: cleaing power of effectivenes of the detergent.


Explanation:


When an experiiment is performed there exists one independent variable, one dependent variable, and some other variables that must be controlled.


The goal of the experiment is to test a hypothesis, which is a statement that relates an effect with a cause and that must be proved true or false.


The effect in the dependent variable, and the cause is the independent variable.


Jenny (the scientist) wants to show how an effect or phenomenun, the dependent variable, is explained by the explanatory, independent, variable.


In the stated experiment, Jenny wants to know how the effectiveness of a new brand detergent and an old one compare with each other. Therefore, she designs a test in which she will determine how the brand of detergent may  explain (explanatory or independent variable) the cleaning power or effectiveness, the dependent variable.


Jenny only can manipulate the independent variable and observe the effect on the dependent variable.


To be conclusive, other variables must be controlled, like the fabric and the amount of dirt of the t-shirts.

4 0
4 years ago
Anthony is standing on the top of a building 10 m high holding a 7 kg
shepuryov [24]

Answer:

548.8 J

Explanation:

5 0
3 years ago
A radioactive substance decays at an annual rate of 131313 percent. If the initial amount of the substance is 325325325 grams, w
anyanavicka [17]

Answer: f_{(t)}=325(0.87)^{t}

Explanation:

If we have an initial amount of a radioactive material or substance, which is 325g,  and we also are told this amount decays 13\% each year, this means each year 87\% of the substance remains:

100\%-13\%=87\%=0.87

<u />

<u>To understand it better:</u>

Year 1: 325(87\%)=325(0.87)

Year 2: 325(0.87)(0.87)=325(0.87)^{2}

Year 3: 325(0.87)(0.87)(0.87)=325(0.87)^{3}

and so on until year t:

Year t: 325(0.87)^{t}

Therefore, the function tha best describes this radiation decay situation is:

f_{(t)}=325(0.87)^{t}

4 0
3 years ago
A ball of mass 0.250 kg and a velocity of + 5.00 m/s collides head-on with a ball of mass 0.800 kg that is initially at rest. No
Mademuasel [1]

Answer:

v_1=-2.616\ m/s

Explanation:

Given that,

Mass of ball 1, m_1=0.25\ kg

Initial speed of ball 1, u_1=5\ m/s

Mass of ball 2, m_2=0.8\ kg

Initial speed of ball 2, u_2=0 (at rest)

After the collision,

Final speed of ball 2, v_2=2.38\ m/s

Let v_2 is the final speed of ball 1.

Initial momentum of the system is :

p_i=m_1u_1+m_2u_2

p_i=0.25\times 5+0

p_i=1.25\ m/s

Final momentum of the system is :

p_f=m_1v_1+m_2v_2

p_f=0.25\times v_1+0.8\times 2.38

p_f=0.25 v_1+1.904

According the law of conservation of linear momentum :

initial momentum = final momentum

1.25=0.25 v_1+1.904

v_1=-2.616\ m/s

So, the final velocity of ball 1 is (-2.616)m/s.

8 0
3 years ago
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