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Nookie1986 [14]
3 years ago
9

Zach, whose mass is 85 kg, is in an elevator descending at 8 m/s. The elevator takes 3.2 s to brake to a stop at the first floor

.What is Zach's weight while the elevator is braking?
Physics
1 answer:
Solnce55 [7]3 years ago
6 0

Explanation:

acceleration = 8/3.2 = 2.5m/s² ( acceleration due to gravity = g ).

mass = 85 kg.

weight = mg = 85×2.5 = 212.5N .

hope this helps you.

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Se golpea una pelota de golf de manera que su velocidad inicial forma un ángulo de 45° con la horizontal. La pelota alcanza el s
nordsb [41]

Answer:

42m/s

6.06s

Explanation:

To find the initial velocity and time in which the ball is fling over the ground you use the following formulas:

x_{max}=\frac{v_o^2sin(2\theta)}{g}\\\\x_{max}=vt_{max}

θ: angle = 45°

vo: initial velocity

g: gravitational constant = 9.8m/s^2

x_max: max distance = 180 m

t_max: max time

by replacing the values of the parameters and do vo the subject of the first formula you obtain:

v_o=\sqrt{\frac{gx_{max}}{sin(2\theta)}}\\\\v_o=\sqrt{\frac{(9.8m/s^2)(180m)}{sin(2(45\°))}}=42\frac{m}{s}

with this value of vo you calculate the max time:

t_{max}=\frac{x_{max}}{v}=\frac{x_{max}}{v_ocos(45\°)}\\\\t_{max}=\frac{180m}{(42m/s)cos(45\°)}=6.06s

hence, the initial velocity of the ball is 42m/s and the time in which the ball is in the air is 6.06s

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TRANSLATION:

Para encontrar la velocidad inicial y el tiempo en el que la pelota está volando sobre el suelo, use las siguientes fórmulas:

θ: ángulo = 45 °

vo: velocidad inicial

g: constante gravitacional = 9.8m / s ^ 2

x_max: distancia máxima = 180 m

t_max: tiempo máximo

reemplazando los valores de los parámetros y haciendo el tema de la primera fórmula que obtiene:

con este valor de vo usted calcula el tiempo máximo:

por lo tanto, la velocidad inicial de la pelota es de 42 m / sy el tiempo en que la pelota está en el aire es de 6.06 s

4 0
3 years ago
What is the mass of an atom with seven protons.seven neutrons,and eight electrons?
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A nitrogen atom with 7 protons and 8 neutrons has a mass number of 15amu however on the periodic table the atomic mass for nitrogen is 14.01
3 0
3 years ago
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1. A 1,000-kg car has 50,000 joules of kinetic energy. What is its speed?
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Use KE= 1/2mv^2
So... 
50,000=(.5)(1,000)v^2
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Divide 500 on both sides 
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Todo sistema heterogêneo é bifásico
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I don't understand the language.....
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Answer:

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Explanation:

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