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Rasek [7]
3 years ago
11

Why do things become hot or cold? Relate to Thermal Energy and The Law of Conservation of Energy

Physics
1 answer:
Mekhanik [1.2K]3 years ago
4 0

<u>Answer:</u>

Things become hot and cold because of the transfer of energy.

<u>Explanation:</u>

The energy possessed by an object or system is called thermal energy and heat is the flow of this energy. While the law of conversation of energy states that energy is not destroyed or created, it just transfers from one object to another.  

When a hot object is placed in normal conditions, it transfers heat to the environment until both are at the same temperature and heat transfers from the environment to the cold objects placed in normal conditions.

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A tennis ball is shot vertically upward in an evacuated chamber inside a tower with an initial speed of 20.0 m/s at time t = 0 s
Ierofanga [76]

Answer:

Time taken to reach its maximum height is 2.04 seconds.

Explanation:

It is given that, a tennis ball is shot vertically upward in an evacuated chamber inside a tower with an initial speed of 20.0 m/s at time t = 0 s.

At maximum height, its final velocity v = 0

Let t is the time taken by the tennis ball to reach its maximum height. We know that for a freely falling object, the value of acceleration is -g or -9.8 m/s².

Using first equation of motion as :

v=u+at

t=\dfrac{v-u}{a}

t=\dfrac{0-20\ m/s}{-9.8\ m/s^2}

t = 2.04 seconds

Therefore, this is the required solution.

4 0
4 years ago
Screw examples in daily life (simple machines)
postnew [5]
Brace and bits, meat grinder, submarine hatch, screw lid jar, drills, machine screws, door lock, wooden handled cork screw. 
5 0
3 years ago
Which displacement value will produce the smallest restoring force if the same spring is used in each case?
nadya68 [22]
The smaller the displacement, the smallest restoring force it will create. 

As seen from the figure given below, The spring system follows the equation,

F = -Kx
 where, x is the displacement
F is the restoring force
k is the spring constant
If , K is kept constant, then,

F is directly proportional to the displacement but it acts in opposite direction due to negative sign.

8 0
4 years ago
(Will give brainliest) The values of the impulse and the time interval for various collisions are listed in the table. In which
igor_vitrenko [27]

Answer:

E) e

Explanation:

Impulse is equal to the product between the force applied (F) and the time interval of the collision (\Delta t):

I=F \Delta t

This means that we can calculate the force for each collision dividing the impulse by the time interval:

F=\frac{I}{\Delta t}

Let's apply the formula to each case:

A) F=\frac{10,000 kg m/s}{10^3 s}=10 N

B) F=\frac{1,000 kg m/s}{10^2 s}=10 N

C) F=\frac{100 kg m/s}{10^1 s}=10 N

D) F=\frac{10 kg m/s}{10^0 s}=10 N

E) F=\frac{1 kg m/s}{10^{-2} s}=100 N

Therefore, the force is the maximum for collision E).

5 0
4 years ago
Read 2 more answers
The time in hours it takes a satellite to complete an orbit around the earth varies directly as the radius of the orbit (from th
nikitadnepr [17]

Answer:It takes a satellite 12.93 hours to complete an orbit around the earth if it is at 1500miles above the earth at a velocity of 38,00mph

Explanation:

Taking 3960miles to be the radius of the earth, we use simple proportions to solve

(1500+3960)/(660+3960) × (32000/38000)× 13 = T in hours to complete orbit.

T=(5460/4620) × (32/38) ×13

T= 12.93hours

4 0
3 years ago
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