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Naily [24]
3 years ago
13

Independent practice

Physics
1 answer:
coldgirl [10]3 years ago
4 0

Explanation:

formula: <u>Mass</u>

Density x volume

2a) m=10kg v=0.3m³

10÷0.3=33.3 kg/m

2b) m = 160 kg V=0.1m³

160÷0.1=1600 kg/m

2c) m = 220 kg V = 0.02m³

220÷0.02=11000 kg/m

A wooden post has a volume of 0.025m³ and a mass of 20kg. Calculate its density in kg/m.

density = volume ÷ mass

20÷ 0.025=800 kg/m

Challenge: A rectangular concrete slab is 0.80m long, 0.60 m wide and 0.04m thick. Calculate its volume in m³.

Formula : Length x width x height = Volume

0.80 x 0.60 x 0.04 = 0.0192m³

B) The mass of the concrete slab is 180 kg. Calculate its density in kg/m.

density = volume ÷ mass

180 ÷ 0.0192 = 9375 kg/m

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3 years ago
Galileo galilei was the first scientist to perform experiments in order to test his ideas. He was also the first astronomer to s
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Answer:

Galileo four key observations are

1. Jupiter has orbiting moons.

2. The Sun has sunspots and rotates on its axis.

3. The Moon has mountains, valleys, and craters.

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Explanation:

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3 years ago
White visible light travels from the Sun to Earth. What is the best description of white light?
aliya0001 [1]

Answer:

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2 years ago
At what distance will a 45 W lightbulb have the same apparent brightness as a 130 W bulb viewed from a distance of 35 m ? (Assum
Sloan [31]

Answer:

20.6 m

Explanation:

P₁ = Power of first bulb = 45 W

P₂ = Power of second bulb = 130 W

r₁ = distance from the first bulb

r₂ = distance from the second bulb = 35 m

Using the equation

\frac{P_{1}}{r_{1}^{2}} = \frac{P_{2}}{r_{2}^{2}}

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