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4 years ago

Two identical soccer balls are rolled toward each other. What will be true after they collide head-on? (2 points)

1 answer:

8 0

well it depends on how much force was added but if they both have the same amount of force and they were rolled at the same time either they will bounce backwards or roll backwards not thats your question will they roll backwards are bounce backwards?

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During the _____ developmental stage children are drawing their thoughts instead of merely observations.

Maru [420]

Answer:

D. pre schematic

Explanation:

During the _pre schematic____ developmental stage children are drawing their thoughts instead of merely observations.

Pre schematic stage in children is the age at which they drawing, symbols, spatial figures to express themselves. Their becomes more complex and full of lines as they age. They use single base lines, multiple base lines and fold up views.

7 0

3 years ago

What is the force of gravitational attraction between an object with a mass of 2kg and another object that has a mass of 2kg and

kupik [55]

Answer:

1.7x10^-10 N

Explanation:

F = G [(m_1)(m_2)]/(r^2)

F = force

G = Gravitational constant 6.67433x10^-11 (N*m^2)/kg^2

m_1 = mass first object

m_2 = mass second object

r = radius between the 2 objects

F = G[(2 kg*2 kg)/(1.25 m)^2]

F = 1.7x10^-10 N

4 0

3 years ago

Water leaks out of a 3,200-gallon storage tank (initially full) at the rate V '(t) = 80 -t, where t is measured in hours and V i

kvasek [131]

Answer:

water leak is 650 gallons

time required to full drain is 80 hrs

Explanation:

given data

volume V = 3200 gallon

rate = V(t) = 80 - t

to find out

how much water leak between 10 and 20 hour and drain complete

solution

we know here rate is 80 - t

so here rate will be

$\frac{dV(t)}{dt}$ = 80 - t

and for time 10 and 20 hour

take integrate between 10 and 20

so water leak = $\int\limits^ {20}_ {10} {(80-t)} \, dt$ .....................1

water leak = ( 80t - $\frac{t^{2} }{2} )^{20}_{10}$

water leak = 650

so water leak is 650 gallons

and

we know here for full tank drain condition

water leak full = 80 t - $\frac{t^{2} }{2}$

3200 = 80 t - $\frac{t^{2} }{2}$

6400 = t² - 160 t

t = 80

so time required to full drain is 80 hrs

6 0

4 years ago

Katrina pushes off a flat sidewalk on her new skateboard<br> What causes her to move?

galina1969 [7]

Answer:

Gravity and Friction

Explanation:

How gravity and friction work which u probably know

8 0

3 years ago

a ball is thrown in the air at 20 m/s. ignoring redistance, what is the speed when it returns to the level at which it was throw

inysia [295]

Ball is projected upwards with speed 20 m/s

now using kinematics

$v_f^2 - v_i^2 = 2 a\delta x$

here when ball returns back to same position.

total displacement of ball will be zero.

$v_f^2 - v_i^2 = 0$

$vf = vi$

So ball will return to initial position with same speed in opposite direction.

6 0

3 years ago