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3 years ago

Need answers quick !! will give brainliest !!

Physics

1 answer:

stiv31 [10]3 years ago

6 0

Answer:

use the bowl of water because Earth's magnetic field is relatively weak. Allowing it to float freely on the water, allows the magnetized needle to freely react to Earth's magnetic field, causing it to align North to South. If you watched closely, the same end of the needle should always point to the North

Explanation:

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A mysterious rocket-propelled object of mass 47.5kg is initially at rest in the middle of the horizontal, frictionless surface o

NARA [144]

Answer:

Distance d=8.63m

Explanation:

mass of object m=47.5 kg

Initial velocity vi=0 m/s

Magnitude of force on object F(t)=(17.0 N/s)t

To find

Distance

Solution

The rocket accelerates due to variable force so we apply Newtons second law but the acceleration will not be constant because the force is not constant

We use ax=Fx/m to find acceleration but it must be integrate to find velocity and then the distance that rocket travels

$ax=Fx/m\\gives\\ax(t)=(17.0N/s)t/(47.5kg)\\ax(t)=(0.35789m/s^{3})t\\ As\\Vx(t)=V_{o}+\int\limits^{}_{} { \lim_{0 \to \ t} ax(t) } \, dt=(0.178945m/s^{3} )t^{2}\\ X-X_{o}=\int\limits^{}_{} { \lim_{0 \to \ t} v(t) } \, dt=(0.05964m/s^{3})t^{3}\\ as\\t=5.25s\\So\\X-X_{o}=(0.05964m/s^{3})(5.25s)^{3}\\X-X_{o}=8.63m$

Distance d=8.63m

8 0

3 years ago

An Olympic diver is on a diving platform 8.60 m above the water. To start her dive, she runs off of the platform with a speed of

Ronch [10]

Answer:

13.1 m/s

Explanation:

If we assume that there is not air resistance then the horizontal component of velocity remains constant. That is 1.23 m/s

The vertical component of final velocity can be calculated the following way:

$v_{yf} ^{2} =v_{yi}^{2} +2ax\\$

$v_{yf} = \sqrt{1.23^{2}+2*9.81*8.60} = 13.0 m/s$

So the final velocity will be the square root of the sum of the squares of the component

v² = 1.23² + 13.0²

v = 13.1 m/s

6 0

3 years ago

Solar radiation is made up of light energy. Light energy can be separated by wavelength and frequency into the electromagnetic s

Sati [7]

Answer:

visible light

Explanation:

we can not see with out visibl e light

6 0

3 years ago

Read 2 more answers

Write a reaction equation to show HCO3 acting as an acid

aniked [119]

Answer: H2CO3

Explanation:

6 0

3 years ago

6. A garden hose attached to a nozzle is used to fill a 15-gal bucket. The inner diameter of the hose is 1.5 cm, and it reduces

Vesna [10]

Answer: 1.135 L/s; 1.35 kg/s, 22.57 m/s

Explanation:

Given

Volume of bucket $V=15\ gal\approx 56.78\ L$

time to fill it $t=50\ s$

Volume flow rate

$\dot{V}=\dfrac{56.78}{50}=1.135\ L/s\approx 1.135\times 10^{-3}\ m^3/s$

The inner diameter of the hose $D=1.5\ cm$

diameter of the nozzle exit $d=0.8\ cm$

we can volume flow rate as

$\Rightarrow \dot{V}=Av\quad \quad \text{v=average velocity through nozzle exit}\\\\\Rightarrow 1.135\times 10^{-3}=\frac{\pi }{4}d^2\times v\\\\\Rightarrow 1.135\times 10^{-3}=\frac{\pi }{4}(0.8\times 10^{-2})^2\times v\\\\\Rightarrow v=\dfrac{4\times 1.135\times 10^{-3}}{\pi \times 64\times 10^{-6}}=22.57\ m/s$

Mass flow rate

$\Rightarrow \dot{m}=\rho \times \dot{V}\\\Rightarrow \dot{m}=1\ kg/L\times 1.135\ L/s=1.35\ kg/s$

5 0

3 years ago