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3 years ago

Crews at the International Space Station are researching the effects of the weightlessness of space on ________.

Physics

2 answers:

Natalija [7]3 years ago

8 0

The answer is A. The human body

andrezito [222]3 years ago

6 0

A: Human Body

C is wrong because they don’t have the tools to test it on another planet

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Consider a basketball player spinning a ball on the tip of a finger. If a player performs 1.99 J of work to set the ball spinnin

sladkih [1.3K]

Answer:

25.8 rad/s

Explanation:

C = circumference of the hollow sphere = 0.749 m

r = radius of the sphere

Circumference of the hollow sphere is given as

C = 2π r

0.749 = 2 (3.14) r

r = 0.12 m

m = mass of the basketball = 0.624 kg

Moment of inertia of basketball is given as

$I = \left ( \frac{2}{3} \right )mr^{2}$

$I = \left ( \frac{2}{3} \right )(0.624)(0.12)^{2}$

I = 5.99 x 10⁻³ kg-m²

w = angular speed

KE = Kinetic energy of the ball = 1.99 J

Kinetic energy of the ball is given as

KE = (0.5) I w²

1.99 = (0.5) (5.99 x 10⁻³) w²

w = 25.8 rad/s

5 0

3 years ago

A 62.0 kg water skier at rest jumps from the dock into a 775 kg boat at rest on the east side of the dock. If the velocity of th

Dominik [7]

Answer:

v = 0.33 m/s

Explanation:

The final velocity of the skier and boat can be calculated by conservation of the lineal momentum:

$m_{1}v_{1i} + m_{2}v_{2i} = m_{1}v_{1f} + m_{2}v_{2f}$

<u>Where:</u>

m1: is the mass of the water skier = 62.0 kg

m2: is the mass of the boat = 775 kg

v1i: is the initial velocity of the water skier = 4.50 m/s

v1f: is the final velocity of the water skier = ?

v2i: is the initial velocity of the boat = 0

v2f: is the final velocity of the boat = ?

Since the final velocity of the skier is the same that the final velocity of the boat, we have:

$m_{1}v_{1i} + m_{2}v_{2i} = m_{1}v_{f} + m_{2}v_{f}$

$m_{1}v_{1i} + 0 = v_{f}(m_{1} + m_{2})$

$v_{f} = \frac{62.0 kg*4.50 m/s}{(62.0 kg + 775 kg)}$

$v_{f} = 0.33 m/s$

Therefore, the final velocity of the skier and boat is 0.33 m/s.

I hope it helps you!

5 0

3 years ago

How to convert 7500kilometers to meters

Kazeer [188]

Answer:

7500000 metres

Explanation:

1 kilometre = 1000 metres

so 7500 kilometres would equal to 7500000 metres

7 0

3 years ago

sebuah cermin cembung memiliki jari-jari kelengkungan 30 cm. sebuah benda diletakkan pada jarak 30 cm di depan cermin. hitunglah

stiks02 [169]

A convex mirror has a radius of curvature of 30 cm. an object is placed at a distance of 30 cm in front of the mirror. compute the location of the shadows and shadow enlargement!

5 0

3 years ago

The burner on an electric stove has a power output of 2.0 kW. A 650 g stainless steel tea kettle is filled with 20∘C water and p

True [87]

Answer:

The value is $V = 900 \ cm^3$

Explanation:

From the question we are told that

The power output is $P_{out} = 2.0 \ kW = 2.0 *10^{3} \ W$

The mass of the steel is $m= 650 \ g = \frac{650}{1000} = 0.650 \ kg$

The temperature of the water is $T = 20^o C$

The time take is $t = 2.70 \ minutes = 2.70 *60 = 162 \ s$

Generally the quantity of heat energy given out by the electric stove is mathematically represented as

$Q = P * t$

=> $Q = 2.0 *10^{3} * 162$

=> $Q = 324000 \ J$

This energy can also be mathematically represented as

$Q = \Delta T * m c_s * + m_w * c_w * \Delta T$

Here $c_s$ is the specific heat of stainless steel with value $c_s = 450\ J/C/kg$

tex]c_s[/tex] is the specific heat of water with value $c_s = 4180\ J/C/kg$

m_w is the mass of water which is mathematically represented as

$m_w = \rho_w * V$

=> $m_w = 1000 * V$

$324000 = (100 -20 ) * 0.650 * 450 * + 1000V * 4180 * (100-20)$

$V = 0.0008989 \ m^3$

converting to $cm^3$

$V = 900 \ cm^3$

8 0

3 years ago