What question can a student BEST answer when comparing and contrasting the models?

He sees a mouse sniffing along at 0.2 m/s but it hears and starts to scurry for safety. In just 4.7 s it speeds up to 1.6 m/s. F

NISA [10]

Answer:

0.30 m/s²

Explanation:

Given:

v₀ = 0.2 m/s

v = 1.6 m/s

t = 4.7 s

Find: a

a = (v − v₀) / t

a = (1.6 m/s − 0.2 m/s) / 4.7 s

a = 0.30 m/s²

8 0

3 years ago

A projectile is shot directly away from Earth's surface. Neglect the rotation of the Earth.

Maksim231197 [3]

Answer:

Explanation:

We shall apply law of conservation of mechanical energy for projectile being thrown .

Total energy on the surface = total energy at height h required

a ) At height h , velocity = .351 x ( 2 GM/R x h )

$\frac{-GM}{R} + \frac{m\times(.351\times\sqrt{2GM})^2 }{2R } = \frac{-GMm}{R+h} + 0$

$\frac{-GMm}{R} +\frac{1}{2}\times \frac{-2GMm}{R} \times0.123=\frac{-GMm}{R+h}$

$\frac{0.877GMm}{R} =\frac{-GMm}{R+h}$

h = .14 R

b )

$\frac{-GM}{R} + \frac{m\times(.351\times2GM) }{2R } = \frac{-GMm}{R+h} + 0$

$\frac{-0.649GMm}{R} = \frac{-GMm}{R+h}$

h = .54 R

c ) least initial mechanical energy required at launch if the projectile is to escape Earth

= GMm / R + 1/2 m (2GM/R)

= 0

5 0

3 years ago

A ball is thrown vertically upward, which is the positive direction. A little while later it returns to its point of release. Th

valkas [14]

Answer:

$v_0=\frac{y}{t}-\frac{at}{2}$

$v_0=49m/s$

Explanation:

We can start from the known formula:

$y=y_f-y_0=v_0t+\frac{at^2}{2}$

so we can write, since we want the initial velocity in terms of the ball's displacement, its acceleration in the vertical direction, and the elapsed time:

$v_0=\frac{y}{t}-\frac{at}{2}$

and for our values we have:

$v_0=\frac{0m}{10s}-\frac{(-9.8m/s^2)(10s)}{2}=49m/s$

3 0

3 years ago

I have two objects – Object A, and Object B. Both weigh 225 grams. Both are hidden in the boxes below. If object A has a density

levacccp [35]

Taking into account the definition of density, the volume of B is larger compared to the volume of A.

<h3>Definition of density</h3>

Density is defined as the property that matter has to compress into a given space and is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

<h3>Volume of each object</h3>

In this case, you know that: