D) steel wheels reduce friction, thus requiring less force to move the load. Friction between rubber and steel would be greater than steel and steel. Friction creates heat, which represents a loss of energy (which has to come from somewhere else - likely from the kinetic energy of the train)

**Answer:**

Volume, V = 13564.8 cubic feet

**Explanation:**

It is given that,

Radius of the cylindrical tank, r = 12 feet

Height of the tank, h = 30 feet

**We need to find the water that can be held by a cylindrical tank i.e. we need to find the volume of the tank. It is given by :**

**V = 13564.8 cubic feet**

**So, the water held by the tank is 13564.8 cubic feet. Hence, this is the required solution.**

**Answer:**

the tension of the rope is **34.95 N**

**Explanation:**

Given;

length of the rope, L = 3 m

mass of the rope, m = 0.105 kg

frequency of the wave, f = 40 Hz

wavelength of the wave, λ = 0.79 m

Let the tension of the rope = T

The speed of the wave is given as;

Therefore, the tension of the rope is **34.95 N**

The magnitude of the **electric field** at a point inside the sphere that lies 8.0 cm from the center is 4.5 ×

Given

Radius = 20 cm

**Electric field** at a point inside the sphere that lies 8.0 cm from the center.

ρ = 1.5 x 10-6 c/m3

E (r) = ρr / 3εο = 1.5 × × 8 × / 3 × 8.85 × = 4.5 ×

The physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them, is known as an electric field (also referred to as an E-field[1]). [2] It also describes the physical field of a system of charged particles. [3] **Electric charges** and time-varying electric currents are the basis of electric fields. A manifestation of the electromagnetic field, one of the four fundamental interactions (sometimes known as forces) of nature, is **electromagnetic fields**, which also include electric and magnetic fields.

Electric fields play a significant role in many branches of physics and are used in electrical engineering. For instance, in atomic physics and chemistry, the electric field acts as the attracting force that holds the atomic nucleus and electrons together in atoms. Additionally, it is the driving force for atoms'** chemical bonds**.

Learn more about** electric field **here:

brainly.com/question/15800304

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**Answer: The mass of ball is 10 grams.**

**Explanation:**

**Given :** Kinetic energy = 4.5 J

Velocity = 30 m/s

**The formula for Kinetic energy is as follows.**

where,

K.E = Kinetic energy

m = mass

v = velocity

**Substitute the values into above formula as follows.**

Thus, we can conclude that **the mass of ball is 10 grams.**