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2 years ago

6

A baseball player hits a baseball with a bat. The mass of the ball is 0.05 kilograms. The ball accelerates at 2,000 meters per s

econd squared.
What is the net force, to the nearest newton, that accelerates the ball?

1 answer:

AlexFokin [52]2 years ago

8 0

Answer:

550

Explanation:

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What is a wavelength of sound wave moving at 340m/s with frequency of 256hz

zimovet [89]

V = 340 m/s
f = 256 Hz
lambda (wavelength)

v = f*lambda
340 = 256 * lambda
340/256 = lambda
lambda = 1.328 m

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3 years ago

A 1000 kg racecar, which is capable of a top speed of 125 m/s, is sitting in a

k0ka [10]

Sitting = no movement
KE=0

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3 years ago

Americium-241 is used in smoke detectors. It undergoes alpha decay with a half life of 432 years. The alpha particles ionize som

babymother [125]

Answer:

860.6 years.

Explanation:

The parameters given are;

Initial detector activity = 370000 alpha decays per second

Final detector activity = 93000 alpha decays per second

Formula for time to change in activity is given by the following relation;

$t_{93000} = \dfrac{-ln\dfrac{A}{A_0} }{\lambda} = \dfrac{-ln\dfrac{93000}{370000} }{5.08 \times 10^{-11}} = 2.72 \times 10^{10} \, seconds$

t₉₃₀₀₀ = 2.72 × 10¹⁰ seconds = 860.6 years.

3 0

3 years ago

a man counts 6 waves on a pond in 10 seconds. the distance between them is 40 cm. what is their speed?

gavmur [86]

Answer:

so a man counts 6 waves on a pound in 10 second

Explanation:

6×10 = 60

60/40

so the answer is3

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3 years ago

While sitting in a swivel chair, you push against the floor with your heel to make the chair spin. The 6.7 N frictional force is

nexus9112 [7]

Answer:

I = 1.4kgm²

Explanation:

The rotational motion is caused by the frictional force, which generates a torque on the system. As there is no other force that creates a torque, this can be expressed in the equation of rotational motion below:

$\tau_f =I\alpha\\\\$

And $\tau_f=rf$ , where r is the distance from the point of application and the rotation axis, and f is the magnitude of the frictional force. This is because the frictional force is applied in the direction that causes the greatest angular acceleration (this is, 90°) and $rf\sin90\°=rf$ . Then, we have that:

$rf=I\alpha\\\\\implies I=\frac{rf}{\alpha}\\\\$

Plugging in the given values, we obtain:

$I=\frac{(0.39m)(6.7N)}{1.8rad/s^{2} } =1.4kgm^{2}$

In words, the total moment of inertia is equal to 1.4kgm².

6 0

3 years ago