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3 years ago

44.2 cm + 0.123 cm = cm

Physics

2 answers:

aalyn [17]3 years ago

7 0

The answer is most likely 44.323cm

trapecia [35]3 years ago

3 0

The answer is 44.323 cm

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A 120 volt refrigerator uses 650 watts. Calculate how much work is done by the refrigerator in one hour.

Blababa [14]

1 Watt = 1 joule/second

650 watts = 650 joules/second

(650 J/sec) x (3,600 seconds/1 hour) = <em>2,340,000 Joules/hour</em>

8 0

3 years ago

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In an experiment, a rectangular block with height h is allowed to float in two separate liquids. In the first liquid, which is w

Amiraneli [1.4K]

Answer:

The relative density of the second liquid is 7.

Explanation:

From archimede's principle we know that the force that a liquid exerts on a object equals to the weight of the liquid that the object displaces.

Let us assume that the volume of the object is 'V'

Thus for the liquid in which the block is completely submerged

The buoyant force should be equal to weight of liquid

Mathematically

$F_{buoyant}=Weight\\\\\rho _{1}\times V\times g=m\times g\\\\\therefore \rho _{1}=\frac{m}{V}...............(i)$

Thus for the liquid in which the block is 1/7 submerged

The buoyant force should be equal to weight of liquid

Mathematically

$F'_{buoyant}=Weight\\\\\rho _{2}\times \frac{V}{7}\times g=m\times g\\\\\therefore \rho _{2}=\frac{7m}{V}.................(ii)$

Comparing equation 'i' and 'ii' we see that

$\rho_{2}=7\times \rho _{1}$

Since the first liquid is water thus $\rho _{1}=1gm/cm^3$

Thus the relative density of the second liquid is 7.

6 0

3 years ago

Read 2 more answers

5. For the following pairs of masses, which one has the largest gravitational attraction between masses? Which one has the small

sasho [114]

Answer:

MOST : E LEAST : D

Explanation:

Grav attraction = G m1 m1 / r^2

G and 'r' are the same for all of the pictures, so the one picture with the biggest mass has the MOST attraction and the one with the least mass has the least attraction.

8 0

2 years ago

Please help me with this! (:

tiny-mole [99]

Answer:

(A) 18 km/h

Explanation:

$4.9\frac{m}{s}=4.9\cdot \frac{\frac{1}{1000}km}{\frac{1}{3600}h}=4.9\cdot3.6\frac{km}{h}=17.64\frac{km}{h}\approx18\frac{km}{h}$

8 0

2 years ago

A bowling ball is far from uniform. Lightweight bowling balls are made of a relatively low-density core surrounded by a thin she

Leni [432]

Answer:

Part a)

$I = 17.4 \times 10^{-3} kg m^2$

Part b)

$I = 14.9 \times 10^{-3} kg m^2$

Explanation:

Part a)

Moment of inertia of the core of the ball

$I_1 = \frac{2}{5}m_1r_1^2$

$I_1 = \frac{2}{5}(1.6)((\frac{0.196}{2})^2)$

$I_1 = 6.14 \times 10^{-3} kg m^2$

now the moment of inertia for thin shell

$I_2 = \frac{2}{3} m_2r_2^2$

$I_2 = \frac{2}{3}(1.6)((\frac{0.206}{2})^2)$

$I_2 = 11.3 \times 10^{-3} kg m^2$

now total inertia of the ball is given as

$I = I_1 + I_2$

$I = 17.4 \times 10^{-3} kg m^2$

Part b)

Moment of inertia of uniform ball of mass 3.2 kg

$I = \frac{2}{5} mr^2$

$I = \frac{2}{5}(3.2)((\frac{0.216}{2})^2)$

$I = 14.9 \times 10^{-3} kg m^2$

4 0

3 years ago