Which of the following universal forces is the weakest? A. electric
B. gravitational
C. strong nuclear

An alpha particle is identical to a(n) helium nucleus. An alpha particle is identical to a helium nucleus because both have two protons and two neutrons. Essentially, a helium atom stripped of its electrons becomes an alpha particle.

The correct option is C.

An alpha particle is a type of ionizing radiation consisting of two protons and two neutrons, essentially a helium nucleus without electrons. These particles have a relatively large mass and carry a positive charge, making them highly ionizing and potentially harmful if they interact with living tissue. Alpha particles are commonly emitted by certain radioactive materials, such as uranium and radon. Due to their limited penetration ability, alpha particles are primarily hazardous when ingested or inhaled, posing significant health risks, including an increased risk of cancer and tissue damage.

An alpha particle is identical to a helium nucleus. Alpha particles are a type of ionizing radiation that consist of two protons and two neutrons, which is also the composition of a helium nucleus without its electrons. In other words, when a helium atom loses its two electrons, it becomes an alpha particle. Thus, an alpha particle can be considered as a helium nucleus.

Hence  The correct option is C.

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80 joules

Further explanation

Given:

A 2 kg mass is held 4 m above the ground.

Let us write as follows:

• m = 2 kg
• h = 4 m

Question:

What is the approximate potential energy (PE) due to gravity of the mass with respect to the ground?

The Process:

We will solve the problem of gravitational potential energy.

Gravitational potential energy = mgh, where m represents mass (in kg), g represents Earth's gravitational field (10 N kg⁻¹), and h represents the height change (in m).

Let us find out the approximate potential energy due to the gravity of the mass concerning the ground on the Earth.

Gravitational potential energy = (2 kg)(10 N kg⁻¹)(4 m)

Thus, gravitational potential energy equal to 80 joules.

_ _ _ _ _ _ _ _ _ _

Notes:

• The equation assumes that the gravitational potential energy gives zero PE (potential energy) at the surface of the Earth. This works for everyday situations but it is not fundamental.
• Newton's theory of universal gravitation states that the field must change with distance.
• As long as it is not stated in the problem, the Earth's gravitational field strength (g) is 10 N kg⁻¹ (or 10 m s⁻²). Unless otherwise specified, for example, g = 9.81 m s⁻², we use this value in calculations. The symbol g can also be called a gravitational acceleration constant.

Learn more

1. A case problem of uniformly accelerated motion and Newton's Second Law brainly.com/question/11181200  
2. Particle's speed and direction of motion brainly.com/question/2814900
3. The energy density of the stored energy  brainly.com/question/9617400

Answer:

190 km/h

Explanation:

randomly picked it

Final answer:

To find the plane's velocity with respect to the ground, we need to consider the combination of the plane's airspeed and the wind's speed and direction. The resulting velocity is 180 km/h north, 60 km/h west.

Explanation:

To find the plane's velocity with respect to the ground, we need to consider the combination of the plane's airspeed and the wind's speed and direction. Since the plane is heading due north and the wind is blowing from the west, we can use vector addition to find the resulting velocity.

First, we break down the airspeed into its north and east components. The north component is 180 km/h, and the east component is 0 km/h because the plane is not moving in that direction.

Next, we break down the wind's velocity into its north and east components. The north component is 0 km/h because the wind is blowing from the west, and the east component is -60 km/h because the wind is against the plane's motion.

Finally, we add the north components together and the east components together. The resulting velocity is 180 km/h north, 60 km/h west. This is the plane's velocity with respect to the ground.

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As you run toward a source of sound, you perceive the frequency of that sound to decrease.

Explanation:

Doppler's effect is a principle used to describe the frequency and the intensity of sound and wavelengths of a source and observer with the two possibilities.

(i) Stationary sound source and moving observer.

(ii) Moving sound source and a stationary observer. It is a relative motion.

Consider when the observer is moving towards a source, the frequency of the sound will be higher and when moving away from the source, the frequency will decrease.

frequency is the speed of vibration and this determines the pitch of the sound. it is only useful or meaningful for musical sounds. where there is a strongly regular waveform. frequency is measured as the number of wave cycles that occur in one second. the unit that is being measured is (hz)