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3 years ago

14

A boy throws a tell ball straight up . disregarding any effects of air resistance, the forces acting 9n the ball untill it retur

ns to the ground is are

1 answer:

Drupady [299]3 years ago

3 0

Well in my opinion I think that is called gravity but I’m no expert.

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A gasoline engine transform approximately 34 percent of the fuel's chemical energy into mechanical energy. if energy is conserve

nekit [7.7K]

A) Most is transformed into thermal energy. I took the test.

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3 years ago

Two positive point charges, each of which has a charge of 2.5 × 10−9 C, are located at y = + 0.50m and y = − 0.50m. Find the mag

Salsk061 [2.6K]

Answer:

The resultant electric force is 14.8N to the right.

Explanation:

Since the three charges aren't in the same line, we have to break down the force in components. First, we need to know the distance from the third charge to the other ones. That is made using the Pythagorean Theorem. As the figure is symmetric with respect to the x-axis, the two distances are the same:

$r=\sqrt{(0.50m)^{2}+(0.70m)^{2}}=0.86m$

Now, we use the Coulomb's Law to obtain the magnitude of the individual forces caused by each charge on the third charge:

$|F_{13}|=k\frac{q_1q_3}{r^{2}} \\\\|F_{13}|=(9*10^{9}Nm^{2}/C^{2})\frac{(2.5*10^{-9}C)(3.0*10^{-9}C)}{(0.86m)^{2}}\\\\|F_{13}|=9.1N$

For the same reason the distances are the same, the magnitude of the forces are the same:

$|F_{23}|=|F_{13}|=9.1N$

So, to get the resultant force, we have to break down this forces in components. To do this, we need their angles with respect to the x-axis. Let θ₁ and θ₂ be these angles, respectively. Then, we calculate them using trigonometry:

$\theta_1=\arctan(\frac{-0.50m}{0.70m})=-35.5\°\\\\\theta_2=\arctan(\frac{0.50m}{0.70m})=35.5\°$

Now, we calculate the components of the forces:

$F_{13}_x=F_{13}\cos\theta_1=9.1N\cos(-35.5\°)=7.4N\\\\F_{13}_y=F_{13}\sin\theta_1=9.1N\sin(-35.5\°)=-5.3N\\\\F_{23}_x=F_{23}\cos\theta_2=9.1N\cos(35.5\°)=7.4N\\\\F_{23}_y=F_{23}\sin\theta_2=9.1N\sin(35.5\°)=5.3N$

Evidently, the y-components cancel out, and the resultant electric force on the third charge is $7.4N+7.4N=14.8N$ along the x-axis (to the right, because it's positive).

8 0

3 years ago

If a car travels 80 miles between 2 and 4 pm, then its velocity is close to 40 mph at 2 pm.

Alisiya [41]

The answer should be false because it doesnt say if the car is traveling at constant speed. The cars speed can be various so that in total for 2 hours that it travels it passes 80 miles. If however it actually traveled at constant speed than the answer is true.

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3 years ago

The dimensions of the disk of our milky way galaxy are:.

Katen [24]

Answer:

According to studies, the milky way is approximately, "170,000–200,000 light-years (52–61 kpc) in diameter and, on average, approximately 1,000 ly (0.3 kpc) thick."

With that being said, it is safe to say that the dimensions are somewhere around 100,000 by 1,000

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3 years ago

Electrons are important to electric current because they are able to

Agata [3.3K]

Electrons are important to the electric current because they are able to move from one atom to another. When an atom loses an electron, it becomes positively charged and when an atom gains an electron, it becomes negatively charged.

4 0

4 years ago