All categories

3 years ago

When a projectile reaches the highest point the vertical component of the acceleration is:

Physics

1 answer:

Mazyrski [523]3 years ago

6 0

Answer:

The acceleration is g.

Taking the upward direction as positive

V = Vy y - 1/2 g t^2

Taking the downward direction as positive

V = -V y + 1/2 g t^2

One can choose either direction as positive, but the acceleration is

the same as g (it is g) while the projectile is in the air.

You might be interested in

A 2 kg soccer ball is traveling 28.62m/s when it hits the wall and bounces off of the wall with a velocity of 20 m/s. If the wal

Lesechka [4]

Answer:

0.149 s or 0.15 s

Explanation:

let initially ball is moving towards left hence initial velocity = - 28.62 m/s

final velocity as ball moves right = +20 m/s

force = rate of change in momentum

force = mass × change in velocity / time

or time = mass × change in velocity / force

time = 2× ( 20 -( -28.62)) / 652.36

time = 2× ( 20 +28.62)) / 652.36

time = 2× 48 .62/652.36

time = 0.149 s or 0.15 s

5 0

3 years ago

What will happen when two objects with opposite electric charges are moved closer together?

LenKa [72]

C the objects will repel each other with greater
force

6 0

3 years ago

Read 2 more answers

A heat pump is to be used for heating a house in winter. The house is to be maintained at 70°F at all times. When the temperatur

Anna35 [415]

Answer:

$\dot{W_{H} } = 4244.48 Btu/h$

Explanation:

Temperature of the house, $T_{H} = 70^{0} F$

Convert to rankine, $T_{H} = 70^{0}+ 460 = 530 R$

Heat is extracted at 40°F i.e $T_{L} = 40^{0}F = 40 + 460 = 500 R$

Calculate the coefficient of performance of the heat pump, COP

$COP = \frac{T_{H} }{T_{H} - T_{L} } \\COP = \frac{530 }{530 - 500 }\\ COP = \frac{530}{30} \\COP = 17.67$

The minimum power required to run the heat pump is given by the formula:

$\dot{W_{H} } = \frac{\dot{Q_{H} }}{COP} \\$ ...............(*)

Where the heat losses from the house, $\dot{Q_{H} } = 75,000 Btu/h$

Substituting these values into * above

$\dot{W_{H} } = \frac{75000}{17.67} \\ \dot{W_{H} } = 4244.48 Btu/h$

3 0

3 years ago

Based on your observations of the six collisions, describe the physical difference between elastic and inelastic collisions.

Ahat [919]

Answer:

Collisions are basically two types: Elastic, and inelastic collision. Elastic collision is defined as the colliding objects return quickly without undergoing any heat generation. Inelastic collision is defined as the where heat is generated, and colliding objects are distorted.

In elastic collision, the total kinetic energy, momentum are conserved, and there is no wasting of energy occurs. Swinging balls is the good example of elastic collision. In inelastic collision, the energy is not conserved it changes from one form to another for example thermal energy or sound energy. Automobile collision is good example, of inelastic collision.

5 0

3 years ago

[04.05] An atom has an atomic number of 12 and a mass number of 25. How many neutrons does the atom have?

gizmo_the_mogwai [7]

Answer: is 13

Explanation:

6 0

3 years ago