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Irina18 [472]
3 years ago
15

While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame, the

speed of the tennis ball is km/h.
Physics
2 answers:
statuscvo [17]3 years ago
3 0
When Alana moving 19km/h, a stationary object will be perceived by her as moving toward her with 19km/h velocity. If the object is not stationary(velocity isn't zero), the speed will increase by the object velocity.

the relative speed of the tennis ball=
the speed of Alana + true speed of the tennis ball
19km/h+ 11km/h= 30km/h
Nastasia [14]3 years ago
3 0

the answer is 11km/h .. i just took the test.

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Helen can write 15 postcards in one hour, while Kate can write
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Answer:5 hours

Explanation:

300 divided by 20 = 15

300 divided by 15 = 20

the difference is 5

4 0
2 years ago
A wave has a frequency of 875 hz and a wavelength of 352 m. At what speed is this wave traveling 
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Answer:

308,000 or 30.8×10^3

Explanation:

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5 0
3 years ago
A 60-watt light bulb has a voltage of 120 bolts applied across it and a current of 0.5 amperes flows through the bulb. What is t
Andre45 [30]

Answer:

240 ohms

Explanation:

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7 0
3 years ago
An unmanned spacecraft leaves for Venus. Which statements about the spacecrafts journey are true?
Yuri [45]
<span>The weight of the spacecraft keeps changing. 
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<span>The mass of the spacecraft remains the same.

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4 0
3 years ago
Read 2 more answers
(15 Points)
oksian1 [2.3K]

The vertical weight carried by the builder at the rear end is F = 308.1 N

<h3>Calculations and Parameters</h3>

Given that:

The weight is carried up along the plane in rotational equilibrium condition

The torque equilibrium condition can be used to solve

We can note that the torque due to the force of the rear person about the position of the front person = Torque due to the weight of the block about the position of the front person

This would lead to:

F(W*cosθ) = mgsinθ(L/2) + mgcosθ(W/2)

F(1cos20)= 197/2(3.10sin20 + 2 cos 20)

Fcos20= 289.55

F= 308.1N

Read more about vertical weight here:

brainly.com/question/15244771

#SPJ1

5 0
2 years ago
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