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3 years ago

What does the term calorie refer to

1 answer:

6 0

Hey there,
<span>It means- the amount of energy required to raise the temperature of a liter of water one degree centigrade at sea level
</span>
Hope this helps :))

~Top

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How can you get acceleration when talking about speed?

vagabundo [1.1K]

Answer:

Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2).

Explanation:

3 0

3 years ago

A 1.95-nC charged particle located at the origin is separated by a distance of 0.0800 m from a 3.78-nC charged particle located

lesya692 [45]

Answer:

(a) The electrostatic force on the 3.78-nC particle is $10.35 \times 10^{-6} N$ along the

positive x axis.

(b) The electrostatic force on the 1.95-nC particle is $10.35 \times 10^{-6} N$ along the

negative x axis.

Explanation:

a.) The electrostatic force on the 3.78 nC particle is

$F_1 = \frac{Q_1 \times Q_2}{4 \pi \epsilon_0 r^2} \hat{i}$ where $Q_1$ is the 1.95 nC charge at the origin, and

$Q_2$ is the 3.78 nC charge at 0.08 m from the origin

r is the distance of 0.08 between the charges

$\epsilon_{0}$ is the relative permittivity of 8.854 × $10^{-12} F/m$ .

Therefore $F_1 = \frac{1.95 \times 10^{-9} \times 3.78 \times 10^{-9}}{4 \times \pi \times 8.854 \time 10^{-12} \times (0.08)^2} = 10.35 \times 10^{-6} Newton$ in the positive x direction.

b.) The electrostatic force on the 1.95 nC particle is the same as the electrostatic force on the 3.78 nC particle except that its direction is in the negative x- axis direction.

3 0

3 years ago

Is the substance below an element,compound, or mixture

quester [9]

It’s a compound Cs there being compounded together

8 0

2 years ago

A wire is made from a material having a temperature coefficient of resistivity of 0.0003125 (°C^-1). In an experiment, we mainta

beks73 [17]

Answer:

The power decreases by 36%

Explanation:

Given:

At 20° C

Power, P₀ = 300 W

Potential difference, V = 150 volts

Now, power is given as

P = V²/R

where, R is the resistance

on substituting the values, we get

300 = 150²/R₀

R₀ = 75 Ω

Now, the variation of resistance with temperature is given as

R = R₀[1 + α(T - T₀)]

where, α is the temperature coefficient of resistivity = 0.0003125 (°C⁻¹)

now, at

T₀ = 20° C

R₀ = 75 Ω

for

T = 1820° C

we have

R = R₀[1 + α(T - T₀)]

substituting the values

we get

R = 75×[1 + 0.0003125 × (1820 - 20)]

R = 117.18 Ω

Now using the formula for power

We have,

P = V²/R

P = 150²/117.18 = 192 W

Therefore, the percentage change will be

= $\frac{P-P_0}{P_0}\times 100$

on substituting the values , we get

= $\frac{192-300}{300}\times 100$

= -36%

here, negative sign depicts the decrease in power

3 0

2 years ago

Read 2 more answers

Concept map for kinetic energy, work and power

Helen [10]

Kinetic energy: the energy of motion

Work: the change in kinetic energy

Power: the rate of work done

Explanation:

The kinetic energy of an object is the energy possessed by the object due to its motion. Mathematically, it is given by:

$K=\frac{1}{2}mv^2$

where

m is the mass of the object

v is its speed

The work done an object is the amount of energy transferred; according to the energy-work theorem, it is equal to the change in kinetic energy of an object:

$W=K_f - K_i$