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Eva8 [605]
3 years ago
14

A basketball referee tosses the ball straight up for the starting tipoff. at what velocity must a basketball player leave the gr

ound to rise 1.25 m above the floor in an attempt to get the ball?
Physics
1 answer:
sladkih [1.3K]3 years ago
5 0
Mgh=mv²/2

v=√2gh=√2·9.8·1.25=4.95m/s
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A particle of mass 4.5 × 10-8 kg and charge +5.4 μC is traveling due east. It enters perpendicularly a magnetic field whose magn
egoroff_w [7]

Answer:

0.00970 s

Explanation:

The centripetal force that causes the charge to move in a circular motion = The force exerted on the charge due to magnetic field

Force due to magnetic field = qvB sin θ

q = charge on the particle = 5.4 μC

v = velocity of the charge

B = magnetic field strength = 2.7 T

θ = angle between the velocity of the charge and the magnetic field = 90°, sin 90° = 1

F = qvB

Centripetal force responsible for circular motion = mv²/r = mvw

where w = angular velocity.

The centripetal force that causes the charge to move in a circular motion = The force exerted on the charge due to magnetic field

mvw = qvB

mw = qB

w = (qB/m) = (5.4 × 10⁻⁶ × 2.7)/(4.5 × 10⁻⁸)

w = 3.24 × 10² rad/s

w = 324 rad/s

w = (angular displacement)/time

Time = (angular displacement)/w

Angular displacement = π rads (half of a circle; 2π/2)

Time = (π/324) = 0.00970 s

Hope this Helps!!!

4 0
3 years ago
Eddie tosses his phone up to his friends window, which is 4 m above the ground. what energy conversion takes place with respect
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A sound wave traveling at 340 m/s is generated by a 480 Hz tuning fork.
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Answer:

Wavelength = 0.7083 meters

Explanation:

Given the following data;

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To find how long is the sound wave, we would determine its wavelength;

Mathematically, the wavelength of a waveform is given by the formula;

Wavelength = velocity/frequency

Wavelength = 340/480

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2 years ago
Without friction, what is the mass of an ball accelerating at 1.8 m/sec2 to which an
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Answer:

<h2>23.33 kg </h2>

Explanation:

The mass of the object can be found by using the formula

m =  \frac{f}{a}  \\

f is the force

a is the acceleration

From the question we have

m  = \frac{42}{1.8}   = 23.3333... \\

We have the final answer as

<h3>23.33 kg</h3>

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Are chemical reactions necessary in life
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