1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
olya-2409 [2.1K]
4 years ago
7

A grade 12 Physics student shoots a basketball

Physics
1 answer:
Nadusha1986 [10]4 years ago
6 0

Answer:

7.84 m/s

Explanation:

Height, h = 2 m

Initial velocity, u = 10 m/s

Angle, A = 80°

(a) Let the time taken to go to the net is t.

Use second equation of motion

h = u t + 0.5 at^2\\\\- 2 = - 10 sin 80 t - 4.9 t^2\\\\4.9 t^2 + 9.8 t - 2 = 0 \\\\t= \frac{- 9.8\pm\sqrt{9.8^2 + 4\times 4.9\times 2}}{9.8}\\\\t = \frac{- 9.8 \pm 11.6}{9.8}\\\\t = - 2.2 s , 0.2 s

Time cannot be negative.

So, t = 0.2 s

The vertical velocity at t = 0.2 s is

v = u + at

v = 10 sin 80 - 9.8 x0.2

v = 9.8 - 1.96 = 7.84 m/s

You might be interested in
A 75.0-kg person is riding in a car moving at 20.0 m/s when the car runs into a bridge abutment. (a) calculate the average force
iragen [17]

(a) -1.5\cdot 10^6 N

First of all, we need to calculate the acceleration of the person, by using the following SUVAT equation:

v^2 -u ^2 = 2ad

where

v = 0 is the final velocity

u = 20.0 m/s is the initial velocity

a is the acceleration

d = 1.00 cm = 0.01 m is the displacement of the person

Solving for a,

a=\frac{v^2-u^2}{2d}=\frac{0-20.0^2}{2(0.01)}=-20000 m/s^2

And the average force on the person is given by

F=ma

with m = 75.0 kg being the mass of the person. Substituting,

F=(75)(-20000)=-1.5\cdot 10^6 N

where the negative sign means the force is opposite to the direction of motion of the person.

b) -1.0\cdot 10^5 N

In this case,

v = 0 is the final velocity

u = 20.0 m/s is the initial velocity

a is the acceleration

d  = 15.00 cm = 0.15 m is the displacement of the person with the air bag

So the acceleration is

a=\frac{v^2-u^2}{2d}=\frac{0-20.0^2}{2(0.15)}=-1333 m/s^2

So the average force on the person is

F=ma=(75)(-1333)=-1.0\cdot 10^5 N

7 0
4 years ago
A light source of wavelength \lambdaλ illuminates a metal with a work function of \text{BE} = 2.00 ~\text{eV}BE=2.00 eV and ejec
dsp73

Answer:

1 eV

Explanation:

Given:

Work function, ∅ = 2.00 eV

Kinetic energy of the ejected of the electron, K.E = 4.0 eV

Now,

using the photoelectric equation , we have

Energy of the photon (E) = ∅ + K.E

also,

E = hc/λ

where, h is plank's constant

c is the speed of the light

λ is the wavelength

thus, we have

hc/λ = 2 + 4 = 6 eV

Energy of photon = 6eV

Now,

for the second case

λ' = 2λ

when Wavelength is doubled , E is halved

thus,

E' = hc/λ'

or

E' = hc/2λ

or

E' = E/2 = 6/2 = 3 eV

also,

E' = ∅ + KE '

thus on substituting the values,

3 = 2 + KE'

or

KE' = 1 eV

Hence, the maximum kinetic energy for the second case is 1 eV

5 0
3 years ago
According to Newton's Brd Law, an object's momentum depends on it's velocity and mass, 4 dog-sled teams
Kryger [21]

Answer:

Team A has the greatest momentum

Explanation:

The momentum of an object is a vector quantity given by

p=mv

where

m is the mass of the object

v is its velocity

In this problem, we have to compare the momenta of the different sleds.

We have:

A) Sled Team A 48 kg moving at 10m/s:

m = 48 kg

v = 10 m/s

p = (48)(10) = 480 kg m/s

B) Sled Team B 14 kg moving at 18m/s

m = 14 kg

v = 18 m/s

p = (14)(18) = 252 kg m/s

C) Sled Team C 28 kg moving at 12m/s

m = 28 kg

v = 12 m/s

p = (28)(12) = 336 kg m/s

D) Sled Team D 22 kg moving at 12m/s

m = 22 kg

v = 12 m/s

p = (22)(12) = 264 kg m/s

So, team A has the greatest momentum.

4 0
3 years ago
Mae prefers to complete graphs or charts to show the information she has learned. What kind of learner is Mae likely to be?
yan [13]

Answer:

Prob. D

Explanation:

I am also a Visual Learner.

3 0
3 years ago
Read 2 more answers
Number of atoms present in 1 mole of oxygen atom
Afina-wow [57]

Answer:

1 mole of every substance has 6.022 × 10^23 particles. This is called Avagadro's constant

3 0
4 years ago
Other questions:
  • As a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and floo
    12·2 answers
  • How did the Maria on the moons surface form?
    15·2 answers
  • Which physical property explains the difference in ability of copper and rubber to transmit electricity?
    9·1 answer
  • Equations of impulse?<br> they all have to start with i= and there has to be three
    13·1 answer
  • Can someone explain how the weight of the block is 10.26N, with reference to an appropriate law of motion?
    5·1 answer
  • An electron and a proton are each accelerated from rest through a potential difference of 100 V. Afterward, which particle has t
    15·1 answer
  • A train started at rest with acceleration of 0.50 m/s^2 and was in motion with constant acceleration for 25 s. How far did it go
    11·1 answer
  • When a crown of mass 14.7kg is completely submerged in water, an accurate scale reading reads only 13.4kg. Is the crown made of
    15·1 answer
  • A motorcycle cop, parked at the side of a highway reading a magazine, is passed by a woman in a red Ferrari 308 GTS doing 120.0
    6·1 answer
  • How is high-ordered conditioned performed
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!