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3 years ago

29. The x-axis of a velocity-time graph represents

Physics

1 answer:

Roman55 [17]3 years ago

8 0

Answer:

Time (s)

Explanation:

The x-axis in velocity-time graph represents the time in second and the y-axis represents the velocity in metres per second (m/s)

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A sled is dragged along a horizontal path at a constant speed of 1.50 m/s by a rope that is inclined at an angle of 30.0° with r

Allisa [31]

Answer:2987.7 J

Explanation:

Given

sled weight is $W=470 N$

Tension in rope $T=230 N$

Time interval $t=10 s$

velocity of sled $v=1.5 m/s$

here speed is equal to velocity which is constant therefore acceleration is zero

thus $F_{net}=0$

Distance traveled in $t=10 s$

$x=v\times t=1.5\times 10=15 m$

considering surface to be friction less

thus $T\cos 30$ will do work on sled

$W=F\cdot x$

$W=T\cos 30\cdot x$

$W=230\cos 30\times 15$

$W=2987.78 J\approx 2.987 kJ$

4 0

3 years ago

According to the law of conservation of charge in alpha decay the total number of protons on one side of the equation equals the

Artyom0805 [142]

Answer:

True

Explanation:

For any equation to be balanced, be it elemental equation or radioactive decay equation, the number of atoms on the left must balance the number of atoms of the right. The same is true for alpha decay as the number of protons on the left side must equal the number of protons on the right side?

3 0

3 years ago

An element's atomic number is the

Zepler [3.9K]

the atomic number of a chemical element (also known as its proton number) is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus.

Hope this helped

8 0

3 years ago

Define heat capacity of a substance.<br>Write the S.I unit of heat capacity.

creativ13 [48]

Define heat capacity of a substance:

The heat capacity of a substance can be defined as the amount of heat required to change its temperature by one degree.

Write the S.I unit of heat capacity:

Joule per Kelvin

$\: \: \:$

Joule per Celsius

$\: \: \:$

-,-

6 0

2 years ago

A cord of mass 0.65 kg is stretched between two supports 28 m apart. if the tension in the cord is 150 n, 2 how long will it tak

MaRussiya [10]

Ans: Time <span>taken by a pulse to travel from one support to the other = 0.348s
</span>
Explanation:
First you need to find out the speed of the wave.

Since
Speed = v = $\sqrt{ \frac{T}{\mu} }$

Where
T = Tension in the cord = 150N
μ = Mass per unit length = mass/Length = 0.65/28 = 0.0232 kg/m

So
v = $\sqrt{ \frac{150}{0.0232} }$ = 80.41 m/s

Now the time-taken by the wave = t = Length/speed = 28/80.41=0.348s

5 0

2 years ago