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Gekata [30.6K]
3 years ago
5

Can someone help me with these questions pls

Physics
1 answer:
gogolik [260]3 years ago
7 0
8. ionic bond because lithium is a metal and oxygen is a non metal.

9. covalent bond because sulfur and oxygen are both non metals.

10. covalent

11. ionic
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The force diagram represents a girl pulling a sled with a mass of 6.0 kg to the left with a force of 10.0 N at a 30.0 degree ang
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the correct answers are 54N and -1,2m/s^2

6 0
3 years ago
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Diagnostic ultrasound of frequency 4.50 MHz is used to examine tumors in soft tissue. (a) What is the wavelength in air of such
mafiozo [28]

(a) 7.62 \times 10^{-5} m is the wavelength in air of such a sound wave.

(b) 3.33 \times 10^{-4}\ m is the wavelength of this wave in tissue.

<u>Explanation:</u>

Frequency and wavelength can be related by the equation,

              Velocity = Wavelength x Frequency

              v=\lambda \times f

where,

v - velocity of light for all EM (electromagnetic) waves in vacuum

Given:

f - 4.50 MHz = 4.50 \times 10^{6} \mathrm{Hz}

a) To find the wavelength in air

We know,

Speed of sound in air = 343 m/s

Apply given frequency and speed of sound in air, we get

        \lambda=\frac{v}{f}=\frac{343}{4.5 \times 10^{6}}=76.2 \times 10^{-6}=7.62 \times 10^{-5}\ \mathrm{m}

b) If the speed of sound in tissue is 1500 m/s, find the wavelength of this wave in tissue

Speed of sound in tissue, v = 1500 m/s

        \lambda=\frac{v}{f}=\frac{1500}{4.5 \times 10^{6}}=333.33 \times 10^{-6}=3.33 \times 10^{-4} \mathrm{m}

4 0
3 years ago
Four hundred seventy joules of heat are removed from a heat reservoir at a temperature of 470 K. What is the entropy change of t
11111nata11111 [884]

Answer:

ΔS= -1 J/K

Explanation:

Given data

Heat Q= -470J

Temperature T=470 K

To find

Entropy change ΔS

Solution

We know that the entropy change of system is ΔS is given by

ΔS=Q/T

We have take heat value Q as negative because the heat is removed from heat reservoir

So

ΔS=(-470J/470K)

ΔS= -1 J/K

8 0
3 years ago
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If a car's mass is 439 kg, what is its weight on earth?
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The correct answer is B.
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A wheelchair moves upward on a 7.1 degree ramp at a speed of 20km/h what is the horizontal velocity
Charra [1.4K]

Answer:

If the wheelchair is up 7.1 ft. In hight the time of flight should be 0.664 seconds and the distance should be 12.108 ft.

Explanation: I divided the displacement by the time and I used the equation Vx = 20 km/m

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