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kotegsom [21]
2 years ago
15

Help Please!!!!!!!!!!!!!!!!!!

Physics
1 answer:
julia-pushkina [17]2 years ago
4 0
The answer is 59.4 degrees.
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What is the momentum of a bird with a mass of 1 kg and a velocity of 5m/s
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It could be one of this 0.2m/s/s
or 0.5m/s/s.
7 0
3 years ago
If the efficiency and mechanical advantage of a certain machine are given as 65 % and 3 respectively.What is the velocity ratio
Vinvika [58]

Answer:

b. 4.6 %

Explanation:

From the question,

E = M.A/V.R................ Equation 1

Where E = percentage Efficiency of the machine, M.A = machanical accurancy of the machine, V.R = Velocity ratio of the machine

Make V.R the subject of the equation

V.R = M.A/E

Given: M.A = 3, E = 65% = 0.65

Substitute this values into equation 2

V.R = 3/0.65

V.R = 4.6

Hence the right option is b. 4.6 $

8 0
3 years ago
A person standing a certain distance from an airplane with four equally noisy jet engines is experiencing a sound level of 145 d
Katyanochek1 [597]

Answer:

The sound level is 138.97 dB.

Explanation:

Given that,

Sound level L= 145 dB

We need to calculate the intensity

Using formula of sound intensity

L=10\log(\dfrac{I}{I_{0}})

Put the value into the formula

145=10\log(\dfrac{I}{I_{0}})

\log(\dfrac{I}{I_{0}})=\dfrac{145}{10}

\log(\dfrac{I}{I_{0}})=14.5

\dfrac{I}{I_{0}}=10^{14.5}

I=10^{14.5}\times I_{0}

I=10^{14.5}\times10^{-12}

I=316.2

We need to calculate the noise of one engine

Using formula of intensity

I'=\dfrac{I}{4}

Put the value into the formula

I'=\dfrac{316.2}{4}

I'=79.05

We need to calculate the intensity level due to one engine

Using formula of sound intensity

L'=10\log(\dfrac{I'}{I_{0}})

L'=10\log(\dfrac{79.05}{10^{-12}})

L'=138.97\ dB

Hence, The sound level is 138.97 dB

5 0
3 years ago
Match the bones with their common name.
mrs_skeptik [129]

1. clavicle = collarbone

2. vertebrae = backbone

3. scapula = shoulder blade

4. femur = thigh

5. humerus = upper arm

6. patella = kneecap

7. cranium = skull

8. tibia = lower leg

9. radius/ulna = forearm

10. phalanges = fingers/toes

7 0
3 years ago
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