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Lady bird [3.3K]
3 years ago
5

Please help!!!! 70 points, i really need this! D:

Physics
2 answers:
jolli1 [7]3 years ago
7 0

1. Frequency 2. measure from trough to trough

Nadusha1986 [10]3 years ago
6 0

Number 1 is frequency

Number 2 is C

Number 3 is D

<h2>I tried my best and i think there right!!</h2>

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Question 1
svetlana [45]

300

Explanation:

100 x 3 =300 simple and easy

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2 years ago
The student draws an arrow on the paper to mark the incident ray. She marks the
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Answer:

Explanation:

Snell's law

1.00sin66 = nsin38

<u>n = 1.48</u>

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3 years ago
The maximum tension that a 0.80 m string can tolerate is 15 N. A 0.35-kg ball attached to this string is being whirled in a vert
zimovet [89]

Answer:

v=5.86 m/s

Explanation:

Given that,

Length of the string, l = 0.8 m

Maximum tension tolerated by the string, F = 15 N

Mass of the ball, m = 0.35 kg

We need to find the maximum speed the ball can have at the top of the circle. The ball is moving under the action of the centripetal force. The length of the string will be the radius of the circular path. The centripetal force is given by the relation as follows :

F=\dfrac{mv^2}{r}

v is the maximum speed

v=\sqrt{\dfrac{Fr}{m}} \\\\v=\sqrt{\dfrac{15\times 0.8}{0.35}} \\\\v=5.86\ m/s

Hence, the maximum speed of the ball is 5.86 m/s.

3 0
3 years ago
A car is traveling at a speed of 45 km/h into town. It takes the car 2 hours to get there. How far has the car traveled?
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Answer:

90 km

Explanation:

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45 x 2 = 90

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Hope this helps!

7 0
3 years ago
Read 2 more answers
A 36.3 kg cart has a velocity of 3 m/s. How much kinetic energy does the object have?
uysha [10]

Answer:

163.35

__________________________________________________________

<u>We are given:</u>

Mass of the object (m) = 36.3 kg

Velocity of the object (v) = 3 m/s

<u>Kinetic Energy of the object:</u>

We know that:

Kinetic Energy = 1/2(mv²)

KE = 1/2(36.3)(3)²            [replacing the variables with the given values]

KE = 18.15 * 9

KE = 163.35 Joules

Hence, the cart has a Kinetic Energy of 163.35 Joules

7 0
3 years ago
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