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3 years ago

In free fall, the ___________ of velocity of the object changes

Physics

1 answer:

aleksley [76]3 years ago

5 0

Answer:

Magnitude and direction.

Explanation:

Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.

Mathematically, velocity is given by the equation;

$Velocity = \frac{distance}{time}$

Gravity is considered to be a universal force of attraction which acts between all objects that has both mass, energy and occupy space. Therefore, it acts in such a way as to bring objects together.

Additionally, the gravity of earth makes it possible for all physical objects to possess weight.

Hence, in free fall, the magnitude and direction of velocity of the object changes.

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A ship travels with velocity given by 12, with current flowing in the direction given by 11 with respect to some co-ordinate axe

nataly862011 [7]

Answer:

$v_x = 11.78 m/s$

Explanation:

Velocity of the ship is given as

$v = 12 units$

the direction of the velocity of the ship is making an angle of 11 degree with the current

so we will have two components of the velocity

1) along the direction of the current

2) perpendicular to the direction of the current

so here we know that the component of the ship velocity along the direction of the current is given as

$v_x = v cos\theta$

$v_x = 12 cos11$

$v_x = 11.78 m/s$

7 0

3 years ago

Technician A says that the rotary engine is not an internal combustion engine, because it does not use pistons. Technician B say

Rama09 [41]

Answer:

Technician B

Step-by-step explanation:

Rotary engine, also known as Wankel, is an internal combustion engine as the definition of inernal combustion is <em>any machine that uses energy from chemical links and transforms it in mechanical work through combustion inside it.</em>

The rotary engine gets three power pulses for each rotation because it can compress, intake/exhaust, and expand at the time in diferent parts of the engine, separated by the tree edges of the triangular rotor.

4 0

3 years ago

. A block of mass 4.0 kg on a spring has displacement as a function of time given by, x (t) = (1.0 cm) cos [(2.0 rad/s) t + 0.25

svlad2 [7]

Answer and Explanation:

1. Evaluate the function x(t) at t=0.5

$x(t)=1cos(2t+0.25)\\x(0.5)=cos(2*0.5+0.25)=cos(1+0.25)=cos(1.25)=0.3153223624\approx0.31cm$

2. The period of motion T can be calculated as:

$T=\frac{2\pi}{\omega}$

Where:

$\omega=2rad/s$

So:

$T=\frac{2\pi}{2}=\pi\approx3.14s$

3. The angular frequency can be expressed as:

$\omega=\sqrt{\frac{k}{m} }$

Solving for k:

$k=(\omega)^2*m=(2)^2*4=4*4=16\frac{N}{m}$

4. Find the derivate of x(t):

$\frac{dx}{dt} =v(t)=-2sin(2t+0.25)$

Now, the sine function reach its maximum value at π/2 so:

$2t+025=\frac{\pi}{2}$

Solving for t:

$t=\frac{\frac{\pi}{2} -0.25}{2} =0.6603981634s$

Evaluating v(t) for 0.6603981634:

$v(0.6603981634)=-2sin(2*0.6603981634+0.25)=-2sin(\frac{\pi}{2} )=-2*1=2$

So the maximum speed of the block is:

$v(0.6603981634)=2cm/s=0.02m/s$

In the negative direction of x-axis

5. The force is given by:

$F=kx$

The cosine function reach its maximum value at 2π so:

$2t+0.25=2\pi$

Solving for t:

$t=\frac{2\pi-0.25}{2} =3.016592654s$

Evaluating x(t) for 3.016592654:

$x(3.016592654)=cos(2*3.016592654+0.25)=cos(2\pi)=1cm=0.01m$

Therefore the the maximum force on the block is:

$F=16*0.01=0.16N$

6 0

3 years ago

What is the frequency of a wave with speed 3m/s and wavelength 6m?

Korolek [52]

The frequency of the radio wave is

Explanation:

Let's use the this formula:

C represents the speed of light, which has a value of approximately

3.00

represents the wavelength and the units should be in meters.

v represents the frequency, which should have units of

−

. Hz is hertz or reciprocal seconds.

Now let's rearrange the equation to solve for v:

3.00

(

)

−

1The frequency of the radio wave is

Explanation:

Let's use the this formula:

C represents the speed of light, which has a value of approximately

3.00

represents the wavelength and the units should be in meters.

v represents the frequency, which should have units of

−

. Hz is hertz or reciprocal seconds.

Now let's rearrange the equation to solve for v:

3.00

(

)

−

1The frequency of the radio wave is

Explanation:

Let's use the this formula:

C represents the speed of light, which has a value of approximately

3.00

represents the wavelength and the units should be in meters.

v represents the frequency, which should have units of

−

. Hz is hertz or reciprocal seconds.

Now let's rearrange the equation to solve for v:

3.00

(

)

−

1The frequency of the radio wave is

Explanation:

Let's use the this formula:

C represents the speed of light, which has a value of approximately

3.00

represents the wavelength and the units should be in meters.

v represents the frequency, which should have units of

−

. Hz is hertz or reciprocal seconds.

Now let's rearrange the equation to solve for v:

3.00

(

)

−

3 0

2 years ago

What is the moment of inertia i of this assembly about the axis through which it is pivoted? Express the moment of inertia in te

charle [14.2K]

Answer:

I = x^2(m1+m2+1/3mr)

Explanation:

8 0

3 years ago

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