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andriy [413]
3 years ago
12

A projectile fired from a gun has initial horizontal and vertical components of velocity equal to 30 m/s and 40 m/s, respectivel

y. 3. Approximately how long does it take the projectile to reach the highest point in its trajectory
Physics
1 answer:
faust18 [17]3 years ago
7 0

Answer:

The time is 5.10 sec.

Explanation:

Given that,

Component of velocity are 30 m/s and 40 m/s.

We need to calculate the resultant velocity

Using formula of resultant velocity

v=\sqrt{v_{x}^2+v_{y}^2}

Put the value into the formula

v=\sqrt{(30)^2+(40)^2}

v=50\ m/s[

We need to calculate the time

Using equation of motion

v = u+gt

v = 0+gt

t=\dfrac{v}{g}

Put the value into the formula

t=\dfrac{50}{9.8}

t=5.10\ sec

Hence, The time is 5.10 sec.

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A sled is initially given a shove up a frictionless 37.0 ∘ incline. It reaches a maximum vertical height 1.20 m higher than wher
labwork [276]

The initial speed of the sled at the given height is 4.85 m/s.

<h3>Initial speed of the sled</h3>

Apply the principle of conservation of energy;

K.E = P.E

¹/₂mv² = mgh

v² = 2gh

v = √2gh

where;

  • h is the vertical height reached
  • g is acceleration due to gravity

v = √(2 x 9.8 x 1.2)

v = 4.85 m/s

Thus, the initial speed of the sled at the given height is 4.85 m/s.

Learn more about initial speed here: brainly.com/question/24493758

#SPJ1

5 0
1 year ago
Certain mushrooms launch their spores by a catapult mechanism. As water condenses from the air onto a spore that is attached to
aleksklad [387]

Answer:

Part a)

a = 2.46 \times 10^4 g

Part b)

a = 100.37 g

Explanation:

Part a)

During the launch

speed will increase from rest to final speed of 1.60 m/s

the distance moved by it is given as

d = 5.30 \mu m

now we have

v_f^2 - v_i^2 = 2ad

1.60^2 - 0 = 2(a)(5.30 \times 10^{-6})

so we have

a = \frac{1.60^2}{2(5.30 \times 10^{-6})}

a = 2.4151 \times 10^5 m/s^2

now in terms of g it is given as

a = 2.46 \times 10^4 g

Part b)

During  speed reduction

we know that final speed will be zero by air in distance 1.30 mm

so we have

v_f^2 - v_i^2 = 2 a d

0 - 1.60^2 = 2(a)(1.30 \times 10^{-3})/tex][tex]a = 984.6 m/s^2

Now in terms of g it is

a = 100.37 g

4 0
2 years ago
Matter's resistance to a change in motion is called
AURORKA [14]

Answer:

Inertia! I hope this helps!

7 0
3 years ago
Read 2 more answers
The lamp cord is 85cm long and comprises cupper wire. Calculate the wire‘s resistance?
DaniilM [7]

Answer:

R = 0.0015Ω

Explanation:

The formula for calculating the resistivity of a material is expressed as;

ρ = RA/l

R is the resistance

ρ is the resistivity

A is the area of the wire

l is the length of the wire

Given

l = 85cm = 0.85m

A = πr²

A = 3.14*0.0018²

A = 0.0000101736m²

ρ = 1.75 × 10-8Ωm.

Substitute into the formula

1.75 × 10-8 = 0.0000101736R/0.85

1.4875× 10-8 = 0.0000101736R

R = 1.4875× 10-8/0.0000101736

R = 0.0015Ω

3 0
3 years ago
Find the kenetic energy of a car of mass 700kg racing with a velocity of 10m/s
fiasKO [112]

Answer:

35000 KJ

Explanation:

The equation for the kinetic energy is given by the formula :

E_{k} = \frac{1}{2} mv^{2}

E_{k} = \frac{1}{2} (700)(10)^{2}

E_{k} = \frac{1}{2} (700)(100)

E_{k} = (350)(100)  OR E_{k} = \frac{1}{2} (70000)

E_{k} = 35000

Units will be kilojoules since the units of mass was kilograms .

Our final answer is 35000 KJ

Hope this helped and have a good day

5 0
2 years ago
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