All categories

3 years ago

If a 20 kg box is accelerating upward at 8 m/s^2 , what is the magnitude of the upward force

Physics

1 answer:

shusha [124]3 years ago

7 0

Answer:

356 N

Explanation:

Newton's second law of motion describes the relationship between an object's mass and the amount of force needed to accelerate it.

here there is a weight acting downwards on the object , yet it is accelerating upwards shows that there is a net force upwards

Applying Newtons second law of motion upwards ,

Force = mass *acceleration

Upward force - m*g = m *a

F_up= 20 *8 + 20 * 9.8

= 356 N

Upward force= 160 N

You might be interested in

When friction slows a sliding block___

Svetradugi [14.3K]

Answer:

Explanation:

When friction slows a sliding block, the kinetic energy of the block is transformed into internal energy .

The frictional movement of two surfaces over one another leads to the conversion of some of their kinetic energies to another energy - heat or thermal energy. Hence, the temperatures of the objects are raised in the process.

Therefore, when a sliding block is slowed down due to friction, some of the kinetic energy of the block would be transformed into internal energy in the form of heat.

The correct option is A.

6 0

2 years ago

Humpback whales are known to produce a collection of elaborate and repeating sounds with frequencies starting at 20 Hz. The soun

jasenka [17]

Answer:

70 m.

Explanation:

Given,

Frequency, f = 20 HZ

speed of sound, v = 1400 m/s

wavelength of the waves = ?

we know,

v = f λ

$\lambda= \dfrac{v}{f}$

$\lambda= \dfrac{1400}{20}$

$\lambda=70\ m$

Hence, the wavelength of the wave is equal to 70 m.

8 0

3 years ago

What did Ernest Rutherford expect to happen when he aimed a beam of particles at a thin gold foil

nikitadnepr [17]

Answer:

he expected a fire to happen I think

4 0

2 years ago

3) El motor de una moto le imprime una velocidad de 90 km/h al aplicar sobre ella una fuerza de 240 N. ¿Cuál es la potencia de l

Alisiya [41]

Answer:

P = 6000 W

Explanation:

The given question is "The motor of a motorcycle gives it a speed of 90 km / h when a force of 240 N is applied to it. What is the power of the motorcycle in watts?"

Given that,

Speed of a motorcycle, v = 90 km/h = 25 m/s

Force applied to the motorcycle, F = 240 N

We need to find the power of the motorcycle. We know that,

Power = Fv

So,

P = 240 N × 25 m/s

= 6000 W

So, the required power of the motorcycle is equal to 6000 W.

5 0

2 years ago

What is the approximate frequency of a photon having an energy 5 × 10−24 j? (h = 6.626 × 10−34 j⋅s)?

Sphinxa [80]

The approximate frequency of the photon is 7.5 GHz. We can find this by taking 5 * 10^-24 Joules and dividing it by 6.626 * 10^-34 Joule Seconds to get 7,546,030,788 Hz (or 7.5 GHz). This was a simple conversion using the provided information.

3 0

3 years ago