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Snezhnost [94]
3 years ago
6

A basketball player jumps straight up for a ball. To do this, he lowers his body 0.260 m and then accelerates through this dista

nce by forcefully straightening his legs. This player leaves the floor with a vertical velocity sufficient to carry him 0.920 m above the floor. (a) Calculate his velocity (in m/s) when he leaves the floor.
Physics
1 answer:
Stels [109]3 years ago
3 0

Answer:

u = 4.25 m/s

Explanation:

The kinematic expression is as follows:

v² = u² - 2as

where

u = initial velocity

v = final velocity

s = distance

g = acceleration due to gravity .

when he reaches a height of 0.920 m above the floor the final velocity  = 0

acceleration due to gravity act opposite the initial direction of motion. So, -9.81 m/s.

v² = u² + 2as

0² - u² = 2 (- 9.81) × 0.920

- u² = 2 × - 9.81 × 0.920

multiply both sides by -1

u² = 2 × 9.81 × 0.920

u² = 18.0504

u = √18.0504

u = 4.2485762321

u = 4.25 m/s

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2 years ago
A large room in a house holds 947 kg of dry air at 33.2°C. A woman opens a window briefly and a cool breeze brings in an additio
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Answer:

31.96362 °C

Explanation:

m_1 = Mass of air in the room = 947 kg

m_2 = Mass of air entering the room = 62.4 kg

T_1 = Temperature in the room = 33.2°C

T_2 = Temperature air entering the room = 13.2°C

T = Equilibrium temperature

c = Specific heat of air = 1006 J/kg °C

In the case of thermal equilibrium we have the relation

m_1c(T_1-T)=m_2c(T-T_2)\\\Rightarrow T=\frac{m_2T_2+m_1T_1}{m_1+m_2}\\\Rightarrow T=\frac{62.4(13.2+273.15)+947(33.2+273.15)}{947+62.4}\\\Rightarrow T=305.11362\ K=305.11362-273.15=31.96362^{\circ}C

The temperature of thermal equilibrium is 31.96362 °C

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3 years ago
A 3.00-kg mass rests on the ground. It is attached to a string which goes vertically to and over an ideal pulley. A second mass
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Answer:A

Explanation:

mass of object=3 kg

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time t=1 s

s=ut+\frac{at^2}{2}

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a=1 m/s^2

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Mg-T=Ma

T=M(g-a)

M=m\frac{g+a}{g-a}

M=3\times \frac{9.8+1}{9.8-1}

M=3\times 1.227

M=3.67 kg

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