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4 years ago

The work done in lifting an apple one meter

Physics

2 answers:

olga nikolaevna [1]4 years ago

6 0

Answer: Option 1: 1 J

Explanation:

Average mass of an apple is between 60 g to 200 g It is not greater than this.

We can take an average mass, m =130 g

This average mass approximation would not affect the final answer.

The work done in lifting any object is given by:

W = m g h

Where, m is the mass of the object, g is the acceleration due to gravity and h is the height to which the object is lifted.

It is given that, h = 1 m

g = 9.8 m/s²

m = 130 g = 0.13 kg

⇒W =0.13 kg×9.8 m/s²×1 m = 1.3 J ≈ 1 J

Thus, the work done in lifting an apple one meter near Earth’s surface is approximately 1 J

exis [7]4 years ago

6 0

If we take an apple of mass 0.1Kg, assuming that the gravitational acceleration is $g=10m/s^2$ , we get $W=1*0.1*10=\boxed{1J}$

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Organ pipe A, with both ends open, has a fundamental frequency of 360 Hz. The third harmonic of organ pipe B, with one end open,

iragen [17]

Answer:

The length of the pipe A is $L_A$ = 0.4763 m & the length of the pipe B is $L_B =$ 0.357 m

Explanation:

Fundamental frequency = 360 Hz

Velocity = 343 $\frac{m}{s}$

(a). Length of the pipe is given by

$L = \frac{V}{2 f}$

Put all the values in above equation we get

$L = \frac{343}{2 (360)}$

$L_A$ = 0.4763 m

(b). Given that

The third harmonic of organ pipe B = the second harmonic of pipe A

$\frac{n_B}{4L_B} = \frac{n_A}{2L_A}$

Thus

$L_B = \frac{2 n_{B} L_A }{4n_A}$

Put all the values in above formula we get

$L_B = \frac{2 (3)(0.4763) }{4(2)}$

$L_B =$ 0.357 m

Therefore the length of the pipe A is $L_A$ = 0.4763 m & the length of the pipe B is $L_B =$ 0.357 m

3 0

3 years ago

A stone is thrown horizontally at a speed of 10.0 m/s from the top of a cliff 139.4 m high.

Lesechka [4]

Answer:

a) 14.2sec

b) 1394m away if horizontal speed never changes

c) 9.8m/s

Explanation:

5 0

3 years ago

Sally travels by car from one city to another. She drives for 30 min at 80 km/hr, 12.0 min at 105 km/hr, and 45 min at 40.0 km/h

Anna [14]

Given :

Sally travels by car from one city to another. She drives for 30 min at 80 km/hr, 12.0 min at 105 km/hr, and 45 min at 40.0 km/hr.

To Find :

The total distance traveled.

Solution :

Total distance traveled is given as sum :

Distance = sum of product of speed and time

D = (v₁ × t₁) + (v₂ × t₂) + (v₃ × t₃)

Putting all given value in this we get :

$D = 80\times \dfrac{30}{60} + 105 \times \dfrac{12}{60} + 40\times \dfrac{45}{60}\\\\D = 91\ km$

Hence, this is the required solution.

6 0

3 years ago

An object falls from rest on a high tower and takes 5.0 s to hit the ground. Calculate the object's position from the top of the

Lena [83]

Answer:

After 1 sec = 4.9 m

After 2 sec = 19.6 m

After 3 sec = 44.1 m

After 4 sec = 78.4 m

After 5 sec = 122.5 m

Explanation:

After 1 sec:

s = ut + (1/2)at²

=0(1) + (1/2)(9.8)(1²) = 4.9m

After 2 sec:

s = ut + (1/2)at²

=0(2) + (1/2)(9.8)(2²) = 19.6m

After 3 sec:

s = ut + (1/2)at²

=0(3) + (1/2)(9.8)(3²) = 44.1m

After 4 sec:

s = ut + (1/2)at²

=0(4) + (1/2)(9.8)(4²) = 78.4m

After 5 sec:

s = ut + (1/2)at²

=0(5) + (1/2)(9.8)(5²) = 122.5m

7 0

3 years ago

Describe how standard of meter, second and kilogram are<br> agreed internationally?

quester [9]

The SI unit is agreed internationally through an agreement known as convention of the meter.

SI unit stands for International System Of Units (SI) - which is the metric system that is used universally as a standard for measurements.

<h3>Some examples of SI unit include;</h3>

meter - unit of length
second - unit of time
kilogram - unit of mass

The SI unit is agreed internationally through an agreement known as convention of the meter, which describes the measurement of fundamental quantities such as mass, time, and length.

Learn more about SI unit here: brainly.com/question/16393390

#SPJ1

5 0

2 years ago