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never [62]
4 years ago
9

With what magnitude of force does a ball of mass 0.75 kilograms need to be hit so that it accelerates at the rate of 25 meters/

secondÆ? Assume that the ball undergoes motion along a straight line.
Physics
1 answer:
zheka24 [161]4 years ago
8 0
The answer is <span>B.19 newtons ..................
Hope this helps ♥</span>
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Two long, straight wires both carry current to the right, are parallel, and are 25 cm apart. Wire one carries a current of 2.0 A
Artemon [7]

Answer:

x = 7.14 meters

Explanation:

It is given that,

Current in wire 1, I_1=2\ A

Current in wire 2, I_2=5\ A  

Distance between parallel wires, r = 25 cm

Let at P point the net magnetic field equal to 0. The magnetic field at a point midway between the is given by :

B=\dfrac{\mu_oI}{2\pi r}

Let the distance is x from wire 1. So,

\dfrac{I_1}{r}=\dfrac{I_2}{(0.25-r)}

\dfrac{2}{r}=\dfrac{5}{(25-r)}

x=\dfrac{50}{7}\ m

x = 7.14 meters

So, the magnetic field will be 0 at a distance of 7.14 meters from wire 1. Hence, this is the required solution.

6 0
3 years ago
A car travels at a constant speed of 25 m/s. Find the power supplied by the engine if it can supply a maximum force of 18,000 N​
mina [271]

Answer:

720

Explanation:

8 0
3 years ago
You have a 78.7 mF capacitor initially charged to a potential difference of 11.5 V. You discharge the capacitor through a 3.03 Ω
Aloiza [94]

Answer:

\tau=0.23\;second

Explanation:

Given,

C=78.7\;mF\\V=11.5\;V\\R=3.03\;\Omega\\

Time constant

\tau=RC\\\tau=78.7\times10^{-3}\times3.03\\\tau=238.461\times10^{-3}\;second\\\tau=0.23\;second

8 0
3 years ago
A violinist is tuning the A string on her violin by listening for beats when this note is played simultaneously with a tuning fo
omeli [17]

Answer:

f_2  = 436 Hz

Explanation:

Given:

- Frequency of the note played f_1 = 440 Hz

- Number of beats heard per second b = 4 Hz

Find:

What was the frequency of the mis-tuned A string?

Solution:

- The beat is the difference in frequency of the notes played and is given by the expression:

                                   | f_1 - f_2 | = beats

- we heard 4 beats, so

                                   | f_1 - f_2 | = 4

- Plug in the value:     | 440 - f_2 | = 4

Hence,                         f_2  = 436 Hz

4 0
3 years ago
The average speed, correspondence to the average speed in a trajectory. True or false?
uranmaximum [27]

Answer:

hablo españolete telo ease

Explanation:

7 0
3 years ago
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