A tray filled with ice is removed from the freezer. After a short period of time, the ice begins to melt.

An astronaut shipwrecked on a distant planet with unknown characteristics is on top of a cliff, which she wishes to descend. She

alexandr402 [8]

Answer:

y = 9.64 m

Explanation:

This exercise should be solved using kinematics in one dimension, let's write the equations for the two cases presented

The rock is released

y = y₀ + V₀₁ t₁ - ½ g t₁²

In this case the speed starts is zero

y = y₀ - ½ g t₁²

The rock is thrown up

y = y₀ + v₀² t₂ -½ g t₂²

The height that reaches the floor is zero

y₀ - ½ g t₁² = y₀ + v₀₂ t₂ - ½ g t₂²

We use the initial velocity with the equation

v₂² = v₀₂² - 2 g y

At the point of maximum height v₂ = 0

v₀₂ = √ (2 g $y_{max}$ )

g (-t₁² + t₂²) = 2 √ (2 g $y_{max}$ ) t₂²

g (- 4.15² + 6.30²) = 2 √ (2 2 g) 6.3

g (22.4675) = 25.2 √ g

g² = 2²5.2 / 22.4675 g

g = 1.12 m / s²

Having the value of g we can use any equation to find the height

y = ½ g t₁²

y = ½ 1.12 4.15²

y = 9.64 m

5 0

3 years ago

at the submicroscopic and microscopic levels temperature is proportional to the average ______ kinetic energy of the particles o

In-s [12.5K]

Answer:

Explanation:

At the submicroscopic and microscopic levels temperature is proportional to the average degree of kinetic energy of the particles of a substance

8 0

3 years ago

Which of the following quantities are vectors? Select all that apply. Which of the following quantities are vectors? Select all

andrew11 [14]

Answer:

1980 kg m/s due south

8.2 m/s2 north-west

Explanation:

In order a quantity to be a vector, it should both has a magnitude and direction.

27 J/s --> Only magnitude. (Power)

1980 kg m/s due south --> Both magnitude and direction. (Momentum)

8.2 m/s2 north-west --> Both magnitude and direction. (Acceleration)

3.2 mi straight up --> Direction is not clear. (Position)

2.9 m/s2 --> Only magnitude. (Magnitude of acceleration)

293 K --> Only magnitude. (Temperature)

200 s --> Only magnitude. (Time)

5 0

3 years ago

Indentify the 3 types of heat tranfer

Elenna [48]

Answer:

Heat is transfered via solid material (conduction), liquids and gases (convection), and electromagnetical waves (radiation).

Feel free to ask...follow me

8 0

3 years ago

Read 2 more answers

The gravitational attraction between a 20 kg cannonball and a 0.002 kg

Naya [18.7K]

Answer:

$2.966\times 10^{-11}\ N$

Explanation:

Given:

Mass of the cannonball (M) = 20 kg

Mass of the marble (m) = 0.002 kg

Distance between the cannonball and marble (d) = 0.30 m

Universal gravitational constant (G) = $6.674\times 10^{-11}\ m^3 kg^{-1} s^{-2}$

Now, we know that, the gravitational force (F) acting between two bodies of masses (m) and (M) separated by a distance (d) is given as:

$F=\dfrac{GMm}{d^2}$

Plug in the given values and solve for 'F'. This gives,

$F=\frac{(6.674\times 10^{-11}\ m^3 kg^{-1} s^{-2})\times (20\ kg)\times (0.002\ kg)}{(0.30\ m)^2}\\\\F=\frac{6.674\times 20\times 0.002\times 10^{-11}\ m^3 kg^{-1+2} s^{-2}}{0.09\ m^2}\\\\F=2.966\times 10^{-11}\ kg\cdot m\cdot s^{-2}\\\\F=2.966\times 10^{-11}\ N.........(1\ N = 1\ kg\cdot m\cdot s^{-2})$

The same force is experienced by both cannonball and marble.

Therefore, the gravitational force of the marble is $2.966\times 10^{-11}\ N$

3 0

3 years ago