The answer is the field vector is perpendicular to the surface.
The electric field's angle with the equipotential surface is always 90 degree. The electric field is always perpendicular to the equipotential surface.
What is electric field?
- The electric field is formally defined as a vector field associated with each location in space, the force per unit charge exerted on a positive test charge at rest at that place.
- The electric charge or time-varying magnetic fields create the electric field. At the atomic level, the electric field is responsible for the attractive forces that hold the atomic nucleus and electrons together.
- The normal vector to a surface, often known as the "normal," is a vector that is perpendicular to the surface at a particular position. When considering normals on closed surfaces, the inward-pointing normal (pointing towards the surface's interior) and outward-pointing normal are commonly differentiated.
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Answer: 
force has the SI units:
SI unit of mass is kg and SI unit of distance is m.
we can bring gravitational constant on one side of the formula and rest all the other terms on right hand side
40 km/hr
Speed = Distance / Time = 120/3 = 40 km/hr
Speed is defined as the rate of change of distance with time. It has the dimension of distance by time. Thus, the SI unit of speed is given as the combination of the basic unit of distance and the basic unit of Time. Thus, the SI unit of speed is metre per second.Speed is a scalar quantity. As a result, it just has magnitude and no definite direction.Velocity and agility: the two kinds of speed.Speed of a moving object depends on two factors–distance moved and time taken.
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Answer:
The distance is 
Explanation:
From the question we are told that
The time interval between the sounds is k
= 0.50 s
The speed of sound in air is 
The speed of sound in the concrete is 
Generally the distance where the collision occurred is mathematically represented as
Now from the question we see that d is the same for both sound waves
So
Now
So 
=> 
=>
=> 
So
The correct answer to the question is : Both can transfer energy through matter, but sound waves can travel through air and infrared waves can travel through space.
EXPLANATION:
Before going to answer this question, first we have to understand the nature of sound and infrared waves.
Sound wave is a longitudinal wave which needs a medium for its propagation. The medium may be solid, liquid or gas. When we produce sound, the vibration of sound is received by our ear, and is heard due to brain.
Unlike sound wave, infrared wave does not require any medium for its propagation. It can travel in space with the speed of light. That's why it is a part of electromagnetic spectrum. But, this wave is neither heard nor seen. Only visible light is seen. Infrared wave can also move in other medium also. It can be transmitted, reflected or absorbed by any medium.
From above, we see that both the waves can transfer energy through matter.
Hence, the second statement perfectly signifies the similarity and difference between them.
