Ask question

Ask question

All categories

4 years ago

8

A projectile starts from rest and moves 4.8 m down a frictionless ramp inclined at 14◦ with the horizontal. The acceleration of

gravity is 9.8 m/s 2 . With what speed will it leave the ramp? Answer in units of m/s.

1 answer:

Sunny_sXe [5.5K]4 years ago

6 0

Answer:166.32 m/s 2

Explanation:

You might be interested in

A canoe floats in a lake. Inside the canoe is a 25 kg steel solid ball. If the ball is thrown into the lake, does the level of t

Rus_ich [418]

Answer:

Explanation:

volume of ball bearing = 4/3 π r³

= 4/3 x 3.14 x 1.5³

= 14.13 cc.

if D be the density of steel , weight of the ball bearing

= 14.13 x D x g

For the first case , water will be displaced to keep it floating

weight of displaced water will be equal to weight of steel

weight of displaced water = 14.13 Dg

mass of displaced water = 14.13 D

volume of displaced water = mass / density of water

= 14.13 D / d ; (where d is density of water) .

Now when the steel ball bearing is dipped in water , it will displace water equal to its volume only and it will be drowned

its volume = 14 .13 cc

14.13 D / d > 14.13 ( because D/d is more than one , since D > d )

volume of water displaced in first case is greater

water level will go up higher in first case .

Hence in the second case water level will go down .

Same will happen in case of 25 kg steel .

4 0

3 years ago

In a rigid container, when the speed of the gas molecules decreases, the pressure of the gas also decreases.

Paraphin [41]

True please mark brainly

8 0

4 years ago

You are sitting on the beach and wondering about the properties of mechanical waves. Describe them in terms of ocean waves.

Rudiy27

Answer:

The ocean waves is a mechanical wave that transmits mechanical energy in the wave by the synchronized and repeated oscillation of the waters about an equilibrium level such that as the wave approaches the shoreline, and the water depth decreases, the height of the wave also increases reflecting the effective transmission of energy while the medium which is the water through which the wave propagates, move back and forth within a small region

Explanation:

A mechanical wave like other waves is the oscillation of a field about an equilibrium level. In mechanical waves, the field consists of the oscillating matter such that the wave transmits energy through a medium. The displacement of the medium through which the wave energy is limited such that the wave energy is conserved to travel far.

7 0

4 years ago

A ball having a mass of 130 g strikes a wall with a speed of 6.5 m/s perpendicular to the wall and rebounds with only 42% of its

RoseWind [281]

Answer

given,

mass of ball = 130 g = 0.13 kg

speed = 6.5 m/s

t = 9.5 ms = 0.0095 s

rebound with 42 % of initial kinetic energy

a) $\dfrac{1}{2}mv_2^2 =0.42\times \dfrac{1}{2}mv_1^2$

$v_2^2 =0.42\times (6.5)^2$

v₂ = 4.212 m/s

b) impulse is equal to change in momentum

$I = m (v_1-v_2)$

$I = 0.13\times(6.5 -(-4.21))$

I = 1.393 kg m/s

c) Force = $\dfrac{I}{t}$

= $\dfrac{1.393}{0.0095}$

F = 146.63 N

4 0

3 years ago

Take thepoints keep up the hard work

Fynjy0 [20]

Answer:

thanks

Explanation:

have a nice day

brainliest?

3 0

3 years ago