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MArishka [77]
3 years ago
6

A runner is jogging in a straight line at a

Physics
1 answer:
soldi70 [24.7K]3 years ago
4 0

Answer:

13 km

Explanation:

The bird flies from the runner, to the finish line, and back to the runner.  We can write two equations for the distance it travels:

d = 7.8 km + 7.8 km − 4.9 km/hr × t

d = 24.5 km/hr × t

Solve for t in the second equation and substitute into the first:

t = d / 24.5

d = 7.8 + 7.8 − 4.9 (d / 24.5)

d = 15.6 − 0.2 d

1.2 d = 15.6

d = 13

The bird flies a cumulative distance of 13 km.

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Help
Blizzard [7]
We can approach this in another way.
We know that sin(∅) = height / hypotenuse.

Thus, for x, height is 1 and hypotenuse is 3. Using Pythagoras theorem,
3² = 1² + b²
b = √8
cos(x) = b/hypotenuse
cos(x) = √8 / 3

Now, lets consider y:
sec(y) = 1 / cos(y) = 1 / base / hypotenuse = hypotenuse / base
The hypotenuse is 25 and the base is 24. We again apply Pythagoras theorem to find the third side, which works out to be:
height = 7
sin(y) = height / hypotenuse
sin(y) = 7/25

Now, sin(x + y) =
sin(x)cos(y) + sin(y)cos(x)
= (1/3)(24/25) + (√8 / 3)(7/25)
= 8/25 + 7√8/75
= (24 + 14√2) / 75
6 0
3 years ago
Read 2 more answers
What did Bohr’s model of the atom include that Rutherford’s model did not have?
hammer [34]
Bohr explained that the electron revolve around a orbit of fixed energy level that Rutherford fails to explain !!!
8 0
3 years ago
Read 2 more answers
Which of the following statements is true? A. Matter requires energy to move and change. B. Energy cannot change from one type t
Naily [24]

A. True.  Matter requires energy to move and change.

B. False.  Energy CAN change from one type to another.  (Like changing the chemical energy in gasoline to kinetic energy of a moving car.)

C. False.  Energy need not remain where it is created.  (Like generating it in an electric power station and shipping it to your house to run your hair dryer.)

D. False.  It IS possible to store energy for later use.  (Like in a battery.)

3 0
2 years ago
An electron is released from rest in a uniform electric field. The electron accelerates vertically upward, traveling 4.5 meters
dem82 [27]

Answer:

The electric and magnetic field are 6.34 N/C and 2.11\times10^{-8}\ T.

Explanation:

Given that,

Distance = 4.5 m

Time = 2.84 μs

We need to calculate the acceleration

Using equation of motion

The distance covered by the electron is

s=ut+\dfrac{1}{2}at^2

When, the electron at rest

s = \dfrac{1}{2}at^2

Where, s = distance

a = acceleration

t = time

Put the value into the formula

4.5=\dfrac{1}{2}\times a\times(2.84\times10^{-6})^2

a=\dfrac{2\times4.5}{(2.84\times10^{-6})^2}

a=1.116\times10^{12}\ m/s^2

We need to calculate the electric field

Using formula of the electric field

E=\dfrac{F}{q}

E=\dfrac{ma}{q}

Put the value into the formula

E=\dfrac{9.1\times10^{-31}\times1.116\times10^{12}}{1.6\times10^{-19}}

E=6.34\ N/C

We need to calculate the magnetic field

Using formula of magnetic field

B = \dfrac{E}{c}

Put the value into the formula

B=\dfrac{6.34}{3\times10^{8}}

B=2.11\times10^{-8}\ T

According to the right hand rule,

The direction of magnetic field is outward because the direction of force is upward.

Hence, The electric and magnetic field are 6.34 N/C and 2.11\times10^{-8}\ T.

8 0
3 years ago
Things move in different _ _ _ _ _ _ _ _ _ ?
Volgvan

Explanation:

Things move in a different direction

8 0
3 years ago
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