The amount of **energy** that is required was found to be **4.184 J**

**define energy ?**

In **physics**, **energy** (from Ancient Greek: v, enérgeia, "activity") is a quantitative quality that is transmitted to a **body** or a **physical** system and is **observable** in the execution of **work** as well as in the form of **heat** and light. The **law** of conservation of **energy** holds that **energy** can be transformed in form but cannot be generated or **destroyed**. The joule is the International System of Units (SI) unit of **measurement** for **energy** (J).

The **kinetic energy** of a moving **object**, the potential **energy** stored by an **object** (for example, due to its position in a field), the **elastic energy **stored in a solid object, **chemical** energy associated with **chemical** reactions, radiant energy carried by **electromagnetic** **radiation**, and internal energy contained within a **thermodynamic** system are all examples of common forms of **energy**. All living creatures continually **absorb** and expel **energy**.

So, to do that, we'll set up our equation so that q **equals** 40.7, and then the specific **heat** of water is 4.184 **joules** per gramme, times **degrees** **celsius**, and since I'm keeping this in **grammes**, this is the correct value of c, and then our final **temperature** minus our initial **temperature**, so 70 **degrees** celsius minus **negative** 10 **degrees** **celsius**, and that gives us 40.7 times 4.184 times 80, which gives us the value of **q**

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Answer:

77.6 Hz

Explanation:

What frequency is received by a person watching an oncoming ambulance moving at 115 km/h and emitting a steady 753 Hz sound from its siren.

The given parameters are:

Observer speed = 115 km/h

Source frequency = 753 Hz

Speed of sound = 342 m/s

First convert km/h to m/s

Observer speed = (115 × 1000) / 3600

Observer speed = 31.94 m/s

The frequency received by the person will be:

F = fv / ( V - v )

Where

F = frequency received by the person

f = siren frequency

V = speed of sound

v = speed of the ambulance

Substitute all the parameters into the formula

F = (753 × 31.94) / ( 342 - 31.94 )

F = 24050.82 / 310.06

F = 77.568 Hz

Therefore, the frequency received by a person is approximately 77.6Hz

<span>If you put a magnet right next to a USB drive, depending on the strength of the magnet and the amount of steel, nickel or cobalt used in the construction of that particular model of USB drive, the drive would either adhere to, or not adhere to, the magnet. This would cause no other significant effects. The storage of data in solid state form (as in USB drives) is not magnetic in nature, so no deletion or any other damage of the stored data would occur.</span>

**Acceleration** = Change in Velocity / Time Interval

So,

A=15/10

**A=1.5m/s.**

**Acceleration** is defined as the rate of change of** velocity** over time. Acceleration is a vector quantity because it has both magnitude and direction. It is also the second derivative of position with respect to time or the first derivative of velocity with respect to time. Acceleration is the name we give to the process of changing velocity. Because speed is speed and direction.

There are only two ways to** accelerate**. Either change speed change direction or change both. Acceleration is the rate of change of **velocity**. At any point in the orbit, the magnitude of the acceleration is given by the rate of change of magnitude and direction of velocity at that point. Velocity is the primary measure of object position and velocity. It can be defined as the distance traveled by an object in a unit of time.

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Complete Question

The angular speed of an automobile engine is increased at a constant rate from 1120 rev/min to 2560 rev/min in 13.8 s.

(a) What is its angular acceleration in revolutions per minute-squared

(b) How many revolutions does the engine make during this 20 s interval?

rev

Answer:

a

b

Explanation:

From the question we are told that

The initial angular speed is

The angular speed after is

The time for revolution considered is

Generally the angular acceleration is mathematically represented as

=>

=>

Generally the number of revolution made is is mathematically represented as

=>

=>