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3 years ago

Someone plzzz helpppppp with this last question

Physics

1 answer:

vredina [299]3 years ago

7 0

Answer:

I dont know someone deleted answers. But they were wrong. INERTIA IS CORRECT I DID THIS IN MY SCHOOL

C IS CORRECT

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A piano has a mass of 99 kg. What is the weight of the piano?

NemiM [27]

Answer:

$D.\ 970\ N$

Explanation:

Given:

Mass of Piano: 99kg

Required:

Calculate its weight

The weight of an object is calculate as thus;

$Weight = Mass\ (m) * Acceleration\ due\ to\ gravity\ (g)$

$m = 99kg$ and $g = 9.8m/s^2$

The formula becomes

$Weight = 99kg * 9.8m/s^2$

$Weight = 970.2\ kgm/s^2$

$Weight = 970.2\ N$

$Weight = 970\ N$ Approximated

Hence, the weight of the piano is 970N

8 0

3 years ago

The moment of a force is calculated from the product of the ———— and the———— distance from the line of action of the force to th

bixtya [17]

Answer: It is the product of the (force)multiplied by the (perpendicular) distance from the line of action of the force to the pivot

Explanation:

7 0

3 years ago

A 55.0 kg student feels a

natta225 [31]

Explanation:

mass of student(M1)=55

mass of book(M2)=?

distance(d)=0.435m

gravitational constant (G)=6.67×10^-11

force(F)=2.68×10^-8

Now,

F=GM1M2/d^2.

then do the numericals .It's taking long time so I escaped Sorry

5 0

3 years ago

The wavelength on a longitude wave is

guajiro [1.7K]

The wavelength in a longitudinal wave is probably the distance between two consecutive compressions or between two consecutive rarefactions. The amplitude is the maximum displacement from equilibrium. ... The amplitude is the distance from the equilibrium position of the medium to a compression or a rarefaction.

6 0

4 years ago

What is the time constant of a series circuit where the capacitor is 0.330μF and the resistor is 10Ω ?

PtichkaEL [24]

Answer:

$\tau=3.3*10^{-6}s$

Explanation:

Take at look to the picture I attached you, using Kirchhoff's current law we get:

$C*\frac{dV}{dt}+\frac{V}{R}=0$

This is a separable first order differential equation, let's solve it step by step:

Express the equation this way:

$\frac{dV}{V}=-\frac{1}{RC}dt$

integrate both sides, the left side will be integrated from an initial voltage v to a final voltage V, and the right side from an initial time 0 to a final time t:

$\int\limits^V_v {\frac{dV}{V} } =-\int\limits^t_0 {\frac{1}{RC} } \, dt$

Evaluating the integrals:

$ln(\frac{V}{v})=e^{\frac{-t}{RC} }$

natural logarithm to both sides in order to isolate V:

$V(t)=ve^{-\frac{t}{RC} }$

Where the term RC is called time constant and is given by:

$\tau=R*C=10*(0.330*10^{-6})=3.3*10^{-6}s$

3 0

3 years ago