A newton is equivalent to which of the following questions?

Physics

1 answer:

taurus [48]3 years ago

7 0

D, because kg x (m/s)2 is basically acceleration and mass. If it’s not d then it’s c. But units of m/s2 are mostly in parentheses.

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I'm stuck on number 4... help please?

Paha777 [63]

Average speed = (distance covered) / (time to cover the distance) =

 (5m) / (15 sec) =

 (5/15) (m/s) = 1/3 m/s .

Average velocity =

 (displacement) / (time spent traveling) in the direction of the displacement

Average velocity = (5m) / (15 sec) left =

 (5/15) / (m/sec) left =

 1/3 m/s left.

A number without a direction is a speed, not a velocity.

3 0

3 years ago

Read 2 more answers

A man strikes one end of a thin rod with a hammer. The speed of sound in the rod is 15 times the speed of sound in air. A woman,

lina2011 [118]

Answer:

44.1 m

Explanation:

Given:

$V_a$ = speed of sound in air = 343 m/s
$V_r$ = speed of sound in the rod = $15V_a$
$\Delta t$ = times interval between the hearing the sound twice = 0.12 s

Assumptions:

$l$ = length of the rod
$t$ = time taken by the sound to travel through the rod
$T$ = time taken by the sound to travel to through air to the same point = $t+\Delta t = t+0.12\ s$

We know that the distance traveled by the sound in a particular medium is equal to the product of the speed of sound in that medium and the time taken.

For traveling sound through the rod, we have

$l=V_r t\\\Rightarrow t = \dfrac{l}{V_r}$ ..........eqn(1)

For traveling sound through the air to the women ear for traveling the same distance, we have

$l=V_aT\\\Rightarrow l=V_a(t+0.12)\\\Rightarrow l=V_a(\dfrac{l}{V_r}+0.12)\,\,\,\,\,\,(\textrm{From eqn (1)})\\\Rightarrow l=V_a(\dfrac{l}{15V_a}+0.12)\\\Rightarrow l=\dfrac{l}{15}+0.12V_a\\\Rightarrow l-\dfrac{l}{15}=0.12V_a\\\Rightarrow \dfrac{14l}{15}=0.12V_a\\\Rightarrow l = \dfrac{15}{14}\times 0.12V_a\\\Rightarrow l = \dfrac{15}{14}\times 0.12\times 343\\\Rightarrow l = \dfrac{15}{14}\times 0.12\times 343\\\Rightarrow l = 44.1\ m$