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3 years ago

Help me please I will give you a crown!!!!

Physics

2 answers:

grigory [225]3 years ago

8 0

Answer:

ID:6207328365

p.a.s.s:qwerty

o.n.l.y f.o.r g.i.r.l.s.

nikitadnepr [17]3 years ago

4 0

Answer:

D. First F, then D, then C

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A 2.1 kg block is dropped from rest from a height of 5.5 m above the top of the spring. When the block is momentarily at rest, t

ella [17]

Answer:

The speed of the block is 8.2 m/s

Explanation:

Given;

mass of block, m = 2.1 kg

height above the top of the spring, h = 5.5 m

First, we determine the spring constant based on the principle of conservation of potential energy

¹/₂Kx² = mg(h +x)

¹/₂K(0.25)² = 2.1 x 9.8(5.5 +0.25)

0.03125K = 118.335

K = 118.335 / 0.03125

K = 3786.72 N/m

Total energy stored in the block at rest is only potential energy given as:

E = U = mgh

U = 2.1 x 9.8 x 5.5 = 113.19 J

Work done in compressing the spring to 15.0 cm:

W = ¹/₂Kx² = ¹/₂ (3786.72)(0.15)² = 42.6 J

This is equal to elastic potential energy stored in the spring,

Then, kinetic energy of the spring is given as:

K.E = E - W

K.E = 113.19 J - 42.6 J

K.E = 70.59 J

To determine the speed of the block due to this energy:

KE = ¹/₂mv²

70.59 = ¹/₂ x 2.1 x v²

70.59 = 1.05v²

v² = 70.59 / 1.05

v² = 67.229

v = √67.229

v = 8.2 m/s

8 0

3 years ago

Read 2 more answers

4500 miles to inches

Volgvan

Answer:

2.8512*10^8 inches

Explanation:

Seeing as the ratio for miles to inches is 1 mile = 63360 inches, set up an equation. 1 mile / 63360 inches = 4500 miles / x inches. Cross multiply and simplify to 2.8512*10^8 inches. Hope this helps! :)

6 0

3 years ago

An input force is applied to a 2 cm diameter piston. The piston compresses oil and is connected to a 4 cm diameter output piston

____ [38]

Answer:

4 times

Explanation:

Given:

diameter of the input piston, $d_i=2\ cm=0.02\ m$

diameter of the output piston, $d_o=4\ cm=0.04\ m$

In such mechanical arrangements the fluid acts as an incompressible link and the pressure remains uniform throughout the fluid bulk.

Then, by the Pascal's law:

$\frac{F_i}{A_i} =\frac{F_o}{A_o}$

where:

$F_i\ \&\ F_o$ are the input and the output forces respectively.

$A_i\ \&\ A_o$ are the input and the output area of pistons respectively.

$\frac{F_i\times 4}{\pi.d_i^2} =\frac{F_o\times 4}{\pi.d_o^2}$

$\frac{F_i}{d_i^2} =\frac{F_o}{d_o^2}$

$\frac{F_o}{0.04^2}=\frac{F_i}{0.02^2}$

$F_o=4\times F_i$

8 0

3 years ago

_____ provides heat to flowing magma that forms convection cells.

Zina [86]

Answer:

Explanation:

Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. The Earth's surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.

3 0

3 years ago

Read 2 more answers

Ohm's Law for electrical circuits is stated VequalsRI, where V is a constant voltage, R is the resistance in ohms and I is the

Annette [7]

Answer:

The resistance interval is $R = 1.8 \pm 0.037$