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4 years ago

Can someone please help me im stuckkk

Physics

2 answers:

Firlakuza [10]4 years ago

5 0

The answer is the Last answer I believe

WINSTONCH [101]4 years ago

3 0

A male having the disease.

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Ignoring air resistance, an object in free fall will fall d feet in t seconds, where d and t are related by the algebraic mode

Lostsunrise [7]

Explanation:

Given that,

An object in free fall will fall d feet in t seconds, where d and t are related by the algebraic model as :

$d=16t^2$ ..........(1)

(a) We need to find the time taken by the object to fall 1148 ft. Put this in equation (1) as :

$16t^2=1148$

$t=\sqrt{71.75}$

t = 8.47 seconds

(b) If the object is in free fall for 18.5 sec after it is dropped, then the height of the object is given by :

$d=16(18.5)^2$

d = 5476 ft

Hence, this is the required solution.

7 0

4 years ago

A 75-hp (shaft output) motor that has an efficiency of 91% is worn out and is replaced by a high efficiency 75-hp motor that has

ZanzabumX [31]

Answer:

The heat gain of the room due to higher efficiency is 2.84 kW.

Explanation:

Given that,

Output power of shaft = 75 hp

Efficiency = 91%

High efficiency = 95.4%

We need to calculate the electric input given to motor

Using formula of efficiency

$\eta=\dfrac{Work\ Output}{Work\ input}$

$Work\ Input =\dfrac{Work\ output}{\eta}$

$Work\ Input =\dfrac{75\times746}{0.91}$

$Work\ Input =61483.51\ W$

$Work\ Input = 61.48 kW$

We need to calculate the electric input

For, heigh efficiency

$Work\ Input_{inc} =\dfrac{75\times746}{0.954}$

$Work\ Input_{int} =58647.7\ W$

$Work\ Input_{int} = 58.64\ kW$

The reduction of the heat gain of the room due to higher efficiency is

$Q=Work\ Input-Work\ Input_{int}$

Put the value into the formula

$Q=61.48 -58.64$

$Q=2.84\ kW$

Hence, The heat gain of the room due to higher efficiency is 2.84 kW.

3 0

3 years ago

What happens to a sound wave when it interferes with another sound wave having the same frequency but traveling in the opposite

Zolol [24]

its called destructive interference.

8 0

3 years ago

Read 2 more answers

According to Newton's 3rd law of motion, if you hit a baseball with a bat it will _____.

Anna [14]

Fly in a straight line unless an outside force changes its course because i tried it once in a baseball game that my mommy rekt me in.

4 0

3 years ago

Read 2 more answers

Consider an experimental setup where charged particles (electrons or protons) are first accelerated by an electric field and the

MissTica

Answer:

V = 10581.59 V

Explanation:

To solve this problem, we have to take into the relation between the kinetic energy of an electron and the energy generated by the potential difference of an electric field. This relation is given by

$E_{k} = E_{V}$

$\frac{1}{2}mv^{2} = eV$

where m is the mass of the electron, v is the velocity of the electron, e is the electric charge and V is the potential difference that accelerated the electron.

By taking V from the last expression we have:

$V = \frac{mv^{2}}{2e} = \frac{(9.1*10^{-31} )(6.1*10^{7})^{2}}{2*(-1.6*10^{-19})}} = 10581.59 V$

where we have taken that

me = 9.1*10^(-31) Kg

e = -1.6*10^(-19) C

v = 6.1*10^(7)

I hope this is useful for you

Regards

6 0

4 years ago