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3 years ago

2. Use the data table below to respond to the

Physics

1 answer:

forsale [732]3 years ago

8 0

Answer:

car d

Explanation:

5555555555555555555

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An object is dropped on Earth from a height of 15 m. What is the magnitude of the velocity of the object just as it hits the gro

ivolga24 [154]

Here, we know, according to 3rd Equation of Kinematics,
v² - u² = 2as

Here, u = 0 [ Free fall ]
a = 9.8 m/s² [ constant value for the Earth system ]
s = 15 m

Substitute their values,
v² - 0² = 2 * 9.8 * 15
v² = 294
v = √294
v = 17.15 m/s

In short, Your Answer would be Option D

Hope this helps!

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3 years ago

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A Venturi tube may be used as a fluid flowmeter. Suppose the device is used at a service station to measure the flow rate of gas

leonid [27]

Answer

given,

flow rate = p = 660 kg/m³

outer radius = 2.8 cm

P₁ - P₂ = 1.20 k Pa

inlet radius = 1.40 cm

using continuity equation

A₁ v₁ = A₂ v₂

π r₁² v₁ = π r₁² v₂

$v_1= \dfrac{r_1^2}{r_2^2} v_2$

$v_1= \dfrac{1.4^2}{2.8^2} v_2$

$v_1= 0.25 v_2$

Applying Bernoulli's equation

$\Delta P = \dfrac{1}{2}\rho (v_2^2-v_1^2)$

$\Delta P = \dfrac{1}{2}\rho (v_2^2-(0.25 v_2)^2)$

$\Delta P = \dfrac{1}{2}\rho v_2^2 (1 - 0.0625)$

$v_2=\sqrt{\dfrac{2\Delta P}{\rho(1 - 0.0625)}}$

$v_2=\sqrt{\dfrac{2\times 1200}{660 \times(1 - 0.0625)}}$

v₂ = 1.97 m/s

b) fluid flow rate

Q = A₂ V₂

Q = π (0.014)² x 1.97

Q = 1.21 x 10⁻³ m³/s

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4 years ago

A tree is turned into sawdust is that physical change or chemical change?

Nana76 [90]

Answer:

Physical

Explanation:

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3 years ago

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What is the current in the circuit at the instant the capacitor begins to charge (the instant the switch is first closed)?

daser333 [38]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The current is $I = 4.2 \ A$

Explanation:

From the question we are told that

The voltage of battery is $V = 25 V$

The capacitance of capacitor is $C = 15 \mu F$

The resistance of the resistor is $R = 6 \Omega$

Generally the current at the instant the capacitor starts charging is

$I = \frac{V}{R}$

substituting values

$I = \frac{25}{6}$

$I = 4.2 \ A$

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3 years ago

Is gravity a force ?

alexandr402 [8]

Answer:

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3 years ago