Where does the word 'robot' come from?

Vikentia [17]

Because you don't have your banana milk, broski

8 0

3 years ago

The displacement d (m) of a block sliding along a straight line is given by the equation d = -0.65 t + 0.21 t2, where t is the t

ivolga24 [154]

Answer:

Explanation:

velocity is the change in displacement of a body with respect to time. Given the displacement d (m) of a block sliding along a straight line is given by the equation d = -0.65 t + 0.21 t², where t is the time in seconds, instantaneous velocity is expressed by differentiating the displacement with respect to time

Velocity = dd/dt

Velocity = -0.65 + 2(0.21)t²⁻¹

Velocity = -0.65 + 0.42t

The instantaneous velocity of the block when t = 2.0 s can be gotten by substituting t = 2.0s into the expression above:

Velocity = -0.65 + 0.42(2)

Velocity = -0.65 + 0.84

Velocity = 0.19

<em>Hence the instantaneous velocity of the block when t = 2.0 s is 0.19m/s</em>

4 0

3 years ago

Which of the following has more inertia, bowling ball or tennis ball, hammer or feather?

MissTica

My answer would be a bowling ball. The rule for inertia is

Mass is that quantity that is solely dependent upon the inertiaof an object. The more inertiathat an object has, the more mass that it has.

Given that rule, if the Bowling Ball, Hammer, Feather, and Tennis Ball were all the standard size, the answer would have to be the bowling ball. MEYBE

8 0

4 years ago

The solar system is 25,000 light years from the center of our Milky Way galaxy. One light year is the distance light travels in

aksik [14]

Answer:

The time period of the solar system's orbit is $2.05\times10^{8}\ year$

Explanation:

Given that,

Distance = 25000 light year

Speed of light $c=3\times10^{8}\ m/s$

Speed of astronomers = 230 m/s

Suppose the orbit is circular, we need to find the time period of the solar system's orbit.

We need to calculate the time period

Using formula of time period

$t = \dfrac{d}{v}$

$t = \dfrac{2\pi r}{v}$

r = distance

t = time

v = speed

Put the value into the formula

$t=\dfrac{2\pi\times25000\times9.46\times10^{15}}{230\times10^{3}}$

$t=6.460\times10^{15}\ sec$

Time in years

$t=\dfrac{6.460\times10^{15}}{3.15\times10^{7}}$

$t=2.05\times10^{8}\ year$

Hence, The time period of the solar system's orbit is $2.05\times10^{8}\ year$

4 0

4 years ago

he coefficent of static friction between the floor of atruck and a box resting on it is 0.30. The truck is travelingat 80.0 km/h

Vedmedyk [2.9K]

Answer:

83.97 m

Explanation:

Without any other external force causing motion in the horizontal direction, it is the frictional force that brings the box to rest. The frictional force has to match the force due to deceleration experienced by the truck to not move.

So,

Frictional force = ma

Then, we calculate frictional force now,

In the vertical direction, the force balance has the weight and the normal reaction equal

N = W = mg

And frictional force = μN = μmg

where μ is the coefficient of friction = 0.3

ma = μmg

a = μg = 0.3 × 9.8 = 2.94 m/s²

Then, using the equations of motion, we obtain the distance over which this deceleration stops the truck

u = initial velocity of the truck = 80 km/h = 22.22 m/s

v = final velocity of the truck = 0 m/s, since the truck comes to rest

a = - 2.94 m/s² (negative sign because it's a deceleration)

x = distance covered during this deceleration = ?

v² = u² + 2ax

0² = 22.22² + 2(-2.94)(x)

5.88x = 493.73

x = 83.97 m

4 0

3 years ago

Read 2 more answers