Physics, 04.02.2020 08:53 kingjames82

Abox of mass 1 kg is hung from a spring scale. the reading on the spring scale is approximately 10n. what would be the reading on the spring scale if a box of mass 5 kg is hung from it? (assume acceleration due to gravity to be 10 m/s2.)
a) 5 n
b) 10 n
c) 50 n
d) 500 n

Answers: 2

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Answer from: danacoots

Explanation:

It is given that,

When mass is, m₁ = 1 kg

The reading on the spring scale, F = 10 N

If the mass is, m₂ = 5 kg

We need to find the reading on the spring scale. The force of gravity is acting on the box which is given by :

F=mg

$F=5\ kg\times 10\ m/s^2$

F = 50 N

So, the reading on the spring scale is 50 N. Hence, this is the required solution.

Answer from: Quest

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol

b. a hockey puck sliding across the ice

c. a compressed spring

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice is the correct option.

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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Abox of mass 1 kg is hung from a spring scale. the reading on the spring scale is approximately 10n....

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