Ask question

Ask question

All categories

3 years ago

11

An olympic sprinter can go from a state of rest to 11 meters per second in 10 seconds. What is the sprinter's average accelerati

on?

2 answers:

Phoenix [80]3 years ago

7 0

Answer: Sprinter's average acceleration = $1.1\frac{m}{s^2}$

Explanation:

The formula for the average acceleration is given as follows:

$\overline{a} = \frac{v_f - v_i}{\Delta t}$ --- (A)

Where,

$v_f$ = Final velocity = $11\frac{m}{s}$

$v_i$ = Initial velocity = $0\frac{m}{s}$

$\Delta t$ = Elapsed time = 10 seconds

Plug the values in equation (A):

$\overline{a} = \frac{11 - 0}{10} = 1.1\frac{m}{s^2}$

Therefore, the sprinter's average acceleration is $1.1\frac{m}{s^2}$ .

Andrew [12]3 years ago

4 0

Since I think the formula for acceleration is a=d/t you plug in 11 for d and 10 for t and get 11/10=1.1 so 1.1 m/s is his/her acceleration.

You might be interested in

Help!!! Asap!!!

KiRa [710]

Answer:

Probs paper cuz the rest are metals

4 0

2 years ago

Salmon often jump waterfalls to reach their

erik [133]

Answer:

6.35 m/s

Explanation:

The motion of the salmon is equivalent to that of a projectile, which consists of two independent motions:

- A horizontal motion with constant speed

- A vertical motion with constant acceleration ( $g=-9.8 m/s^2$ , acceleration of gravity)

The horizontal velocity of the salmon is given by:

$v_x = u cos \theta$

where

u = ? is the initial speed

$\theta=32^{\circ}$ is the angle of projection

Then the horizontal distance covered by the salmon after a time t is given by

$d=v_x t =(u cos \theta) t$

Or equivalently, the time taken to cover a distance d is

$t=\frac{d}{u cos \theta}$ (1)

Along the vertical direction, the equation of motion is

$h = (u sin \theta) t + \frac{1}{2}gt^2$ (2)

where

$u sin \theta$ is the initial vertical velocity

If we substitute (1) into (2), we get:

$h = (u sin \theta) \frac{d}{cos \theta} + \frac{1}{2}g(\frac{d}{ ucos \theta})^2=d tan \theta + \frac{gd^2}{2u^2 cos^2 \theta}$

We now that in order to reach the breeding grounds, the salmon must travel a distance of

d = 2.02 m

reaching a height of

h = 0.574 m

Substituting these data into the equation and solving for u, we find the initial speed that the salmon must have:

$u =\sqrt{ \frac{gd^2}{2(h-d tan \theta) cos^2 \theta}}=\sqrt{\frac{(-9.8)(2.02)^2}{2(0.574-(2.02)(tan 32))(cos^2(32))}}=6.35 m/s$

8 0

3 years ago

Which is a characteristic of all ions?

zzz [600]

Answer:>

Explanation:

All ionic compounds have high melting and boiling points

6 0

3 years ago

Read 2 more answers

Recall that force is a change in momentum over a change in time, the force due to radiation pressure reflected off of a solar sa

Zarrin [17]

Answer:

magnitude of the pressure on the sail in the vicinity of Earth’s Orbit= $\frac{2I}{c}$

Explanation:

The momentum of a photon is:

p = E/c

E = the photon energy

c = the speed of light.

take the time derivative (gives the force)

F = dp/dt = (dE/dt)/c

F = 2(dE/dt)/c (is doubled for complete reflection of the light)

Intensity has the units of energy per unit time per unit area

= I

then,

Force/unit area = 2I/c

magnitude of the pressure on the sail in the vicinity of Earth’s Orbit= $\frac{2I}{c}$

4 0

3 years ago

The largest building in the world by volume is the boeing 747 plant in Everett, Washington. It measures approximately 632 m long

Schach [20]

Explanation:

Given that,

The dimensions of the largest building in the world is 632 m long, 710 yards wide, and 112 ft high. It basically forms a cuboid. The volume of a cuboidal shape is given by :

Since,

1 meter = 3.28084 feet

632 m = 2073.49 feet

1 yard= 3 feet

710 yards = 2130 feet

V = lbh

$V=2073.49 \ ft\times 2130\ ft\times 112\ ft$

$V=494651774.4\ ft^3$

$V=4.94\times 10^8\ ft^3$

Also,

$V=(4.94\times 10^8\ ft^3)(\dfrac{1\ m}{3.281})^3$

$V=1.39\times 10^7\ m^3$

Hence, this is the required solution.

3 0

4 years ago