### Rosita weighed 50 n when she traveled to mars, a planet with an acceleration due to gravity that is about one-third as large as earthâs acceleration due to gravity. about how much does rosita weigh on earth?

ANSWERED AT 18/11/2019 - 03:38 AM

QUESTION POSTED AT 18/11/2019 - 03:38 AM

### A new roller coaster contains a loop-the-loop in which the car and rider are completely upside down if the radius of the loop is

ANSWERED AT 18/11/2019 - 03:33 AM

QUESTION POSTED AT 18/11/2019 - 03:33 AM

### An iron sphere with a mass of 75.00 g is heated to a temperature of 385.0Â°c. it is then placed in a beaker containing 150.0 g h2o at 100.0Â°c. how much heat energy must the water absorb to boil away completely? kj what is the maximum amount of heat the iron can release to the water? kj

Question one the answer is 339 kj

Question two the answer is 9.02 kj

Question three - No

ANSWERED AT 18/11/2019 - 03:33 AM

QUESTION POSTED AT 18/11/2019 - 03:33 AM

### Convection in the atmosphere is the process whereby air masses rise and fall, distributing heat and moisture over the planet. a. True b. False

ANSWERED AT 18/11/2019 - 03:29 AM

QUESTION POSTED AT 18/11/2019 - 03:29 AM

### Suppose that a constant force is applied to an object. newton's second law of motion states that the acceleration of the object varies inversely with its mass. a certain force acting upon an object with mass 2 kg produces an acceleration of 38 /ms2 . if the same force acts upon another object whose mass is 19 kg , what would this object's acceleration be?

Newton’s second law states that force is the product of mass and acceleration. This is expressed mathematically as:

F = m * a

Where F = force, m = mass, a = acceleration

Since in the given problem, the force is constant or same force is acting upon two objects. Therefore we can simply equate the expression m * a of the 2 objects.

m1 * a1 = m2 * a2

Where m1 = 2 kg, a1 = 38 m/s^2, m2 = 19 kg. Therefore finding for a2:

2 kg * 38 m/s^2 = 19 kg * a2

**a2 = 4 m/s^2 (ANSWER)**

ANSWERED AT 18/11/2019 - 03:29 AM

QUESTION POSTED AT 18/11/2019 - 03:29 AM

### The position function x (6.0 m) cos[(3p rad/s)t p/3 rad]gives the simple harmonic motionof a body. at t 2.0 s, what are the(a) displacement, (b) velocity, (c)acceleration, and (d) phase of the motion? also, what are the (e)frequency and (f) period of the motion?

The correct formula for this simple harmonic motion is:

x = (6.0) cos [ (3 pi) t + pi/3 ]

A. Calculating for displacement x at t = 2:

x =6.0 cos (19/3 pi)

x = 6 (0.5)

x = 3 m

B. Velocity is equivalent to the 1st derivative of the equation. v = dx / dt

Velocity v = dx/dt = -18 pi sin (3pi t + pi/3)

v = - 18 pi sin (6pi + pi/3)

v = 49.0 m/s

C. Acceleration is the 2nd
derivative or the 1st derivative of velocity dv / dt

Acceleration a = dv/dt = -54 pi^2 cos(3pi t + pi/3)

a = -54 pi^2 cos(3pi * 2 + pi/3)

a = 386.34 m/s^2

D. Phase = pi/3

E. frequency f= 3pi/2pi = 1.5Hz

F. period = 1/f = 1/1.5 = .6667sec

ANSWERED AT 18/11/2019 - 03:16 AM

QUESTION POSTED AT 18/11/2019 - 03:16 AM

### What happens to an electric current when it flows through an object with resistance?

ANSWERED AT 18/11/2019 - 03:08 AM

QUESTION POSTED AT 18/11/2019 - 03:08 AM

### How do the components of a vector transform under a translation of coordinates?

ANSWERED AT 18/11/2019 - 03:07 AM

QUESTION POSTED AT 18/11/2019 - 03:07 AM

### If the pressure on a gas sample is tripled and the absolute temperature is quadrupled, by what factor will the volume of the sample change?

V = nRT/P = kT/P

The term k is lumped as a constant because they are the same before and after the change. Next, we find the ratio of V1 (before the change) and V2 (after the change).

V2/V1 = (k*4T/3P)/(kT/P)

Cancelling out like terms would yield

V2/V1 = 4/3

Therefore, the volume after the change is 4/3 of the original volume. This means that the volume increased by (4/3-1 = 1/3 or 33%) 33% after the change of conditions.

ANSWERED AT 18/11/2019 - 02:55 AM

QUESTION POSTED AT 18/11/2019 - 02:55 AM

### An air core solenoid with 68 turns is 8 cm long and has a diameter of 1.2 cm. how much energy is stored in its magnetic field when it carries a current of 0.77a?

To determine the energy stored in the magnetic field, use the formula: E = ½ LI2 where E is the energy stored, L is the inductance (units: Henry), and I is the current (units: Ampere).

Correspondingly, L = (µN2A)/l, where, µ = permeability of medium (in this case, air), N = no. of turns, A = cross-sectional area, and l = length. Given: N = 68 turns, l = 8 cm, d = 1.2 cm, and I = 0.77 A, other necessary variables are A = 1.13 cm2 and µair = 1.2566 x 10-6 H/m. Applying the formula and checking that the units agree with each other, the final answer is 2.4352 x 10-6 J.ANSWERED AT 18/11/2019 - 02:55 AM

QUESTION POSTED AT 18/11/2019 - 02:55 AM

### What effect does heating a solid to a high temperature have on its crystal lattice?

ANSWERED AT 18/11/2019 - 02:55 AM

QUESTION POSTED AT 18/11/2019 - 02:55 AM

### If 60 lbs of force must be applied to the valve for it to open, how much upward force must push rod X apply for the valve to open?

ANSWERED AT 18/11/2019 - 02:51 AM

QUESTION POSTED AT 18/11/2019 - 02:51 AM

### During a breath, the average human lung expands by about 0.50 l. part a if this expansion occurs against an external pressure of 1.0 atm, how much work (in j) is done during the expansion?

W = PdV

Integrating and assuming that P is not affected by changes in V or it is constant, then we will have:

W = P (V2 - V1)

Substituting the given values:

P = 1.0 atm = 101325 Pa

(V2 - V1) = 0.50 L =

W = 101325 N/m^3 ( 0.50) (1/1000) m^3

**W = 50.66 N-m or 50.66 J**

So, in the expansion process about 50.66 J of work is being done.

ANSWERED AT 18/11/2019 - 02:45 AM

QUESTION POSTED AT 18/11/2019 - 02:45 AM

### A one-family dwelling contains an electric range rated at 25 kw. what is the neutral load demand for this range

right answer 13.2kW. or 13200VA,

after 12kW, 5% times one additional kW. 13kWx5%=0.65

220.55 table 1 appliance column C 8kW

8x1.65=13.2kW or 13200VA

ANSWERED AT 18/11/2019 - 02:44 AM

QUESTION POSTED AT 18/11/2019 - 02:44 AM

### If you are in a rear-wheel skid, you must release your brakes and turn your steering wheel __________ a. into the direction of the skid. b. opposite direction of the skid. c. straight.

ANSWERED AT 18/11/2019 - 02:40 AM

QUESTION POSTED AT 18/11/2019 - 02:40 AM

### A boat is floating in a small pond. the boat then sinks so that it is completely submerged. what happens to the level of the pond?

It increases!

ANSWERED AT 18/11/2019 - 02:37 AM

QUESTION POSTED AT 18/11/2019 - 02:37 AM

### A landscaper is making a retaining wall to shore up the side of a hill. to ensure against collapse, the wall should make an angle 75Â° with the ground. how far from the base of the hill is the base of a 15-foot slanted wall?

Let x = distance of the base of the ladder from the base of the hill.

By definition,

sin(75°) = x/15

x = 75*cos(75°) = 3.882 ft

Answer:

The distance between the base of the hill and the base of the ladder is 3.9 ft (nearest tenth)

ANSWERED AT 18/11/2019 - 02:36 AM

QUESTION POSTED AT 18/11/2019 - 02:36 AM

### A bird flew16 km west in 5 hours, then flew 20 km east in 6 hours. what was the birdâs velocity?

Answer: speed =

**3.27273 kilometers per hour**

To solve for speed or rate use the formula for speed, s = d/t which means speed equals distance divided by time.

speed = distance/time

ANSWERED AT 18/11/2019 - 02:32 AM

QUESTION POSTED AT 18/11/2019 - 02:32 AM

### As the external magnetic field decreases, an induced current flows in the coil. what is the direction of the induced magnetic field caused by this current?

ANSWERED AT 18/11/2019 - 02:31 AM

QUESTION POSTED AT 18/11/2019 - 02:31 AM

### Theories have both an explanatory and a predictive function. a. True b. False

**Answer:**

true

**Explanation:**

Theories have both an explanatory an a predictive function.

ANSWERED AT 18/11/2019 - 02:31 AM

QUESTION POSTED AT 18/11/2019 - 02:31 AM

### Stars originate as large bodies of slowly rotating gas. because of gravity, these clumps of gas slowly decrease in size. the angular velocity of a star increases as it shrinks because of

This is because in a rotary system with decreasing diameter, the angular momentum should be conserved (as long as the net torque is zero) based on physics conservation laws

ANSWERED AT 18/11/2019 - 02:23 AM

QUESTION POSTED AT 18/11/2019 - 02:23 AM

### A basketball is tossed up into the air, falls freely, and bounces from the wooden floor. from the moment after the player releases it until the ball reaches the top of its bounce, what is the smallest system for which momentum is conserved? the ball plus player the ball momentum is not conserved the ball plus earth

ANSWERED AT 18/11/2019 - 02:23 AM

QUESTION POSTED AT 18/11/2019 - 02:23 AM

### At what condition the screw guage does not have zero error?

You will arrive with a zero error if: The thimble is above the datum line. Else, the result will always be positive. I honestly forgot the reasoning behind why that is but there is a formula for that and you can use it to prove what I just shared. Better luck!

ANSWERED AT 18/11/2019 - 02:19 AM

QUESTION POSTED AT 18/11/2019 - 02:19 AM

### The distance, in feet, a moving object has traveled after t seconds is given by 2t/(4 + t). find the acceleration of the object after 5 seconds. (round your answer to three decimal places.)

a = (Vf - Vi)/t ; where distance d = [2(t)]/(4+t), t = 5secs, and Vi = 0

a = [(2t)/(4+t)]/t <---- working equation

a = {[2(5)]/9}/5 <---- cancel 5

a = 2/9 ft/s^2 <---- Answer

ANSWERED AT 18/11/2019 - 02:18 AM

QUESTION POSTED AT 18/11/2019 - 02:18 AM

### A 1.0 kg football is given an initial velocity at ground level of 20.0 m/s [37 above horizontal]. It gets blocked just after reaching a height of 3.0 m. (a) What is the velocity of the football when it first reaches a height of 3.0 m above the level ground? (b) What horizontal distance has the ball travelled when it first reaches a height of 3.0 m above ground?

Neglect air resistance.

The horizontal component of the launch velocity is

(20 m/s)*cos(37°) = 15.973 m/s

The vertical component of the launch velocity is

(20 m/s)*sin(37°) = 12.036 m/s

The acceleration due to gravity is g =9.8 m/s².

The time, t s, for the ball to reach a height of 3 m is given by

(12.036 m/s)*(t s) - (1/2)*(9.8 m/s²)*(t s)² = (3 m)

12.036t - 4.9t² - 3 = 0

2.4543t - t² - 0.6122 = 0

t² - 2.4563t + 0.6122 = 0

Solve with the quadratic formula.

t = (1/2)[2.4563 +/- √(6.0334 - 2.4488)]

t = 2.1748 or 0.2815 s

The ball reaches a height of 3 m twice.

The first time it reaches 3 m height is 0.2815 s.

Part a.

The vertical velocity when t = 0.2815 s is

Vy = 12.036 - 9.8*0.2815

= 9.2773 m/s

The horizontal component of velocity is Vx = 15.973 m/s

The resultant velocity is

√(9.2773² + 15.973² ) = 18.47 m/s

Answer:

The velocity at a height of 3.0 m is 18.5 m/s (nearest tenth)

Part b.

The horizontal distance traveled is

d = (15.973 m/s)*(0.2815 s) = 4.4964 m

Answer:

The horizontal distance traveled is 4.5 m (nearest tenth)

ANSWERED AT 18/11/2019 - 02:12 AM

QUESTION POSTED AT 18/11/2019 - 02:12 AM

### Ben(55 kg) is standing on very slippery ice when junior(25kg) bumps into him. junior was moving at a speed of 8m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision .

m₁= 55 kg, mass of Ben

m₂ = 25 kg, mass of Junior

v₁ = 0, initial speed of Ben (he was stationary)

v₂ = 8 m/s, speed of Junior

Consider the motion of Ben and Junior as occurring within a closed system.

Because momentum is preserved, the initial momentum of the system is equal to the final momentum of the system.

Refer to the figure shown below.

The initial momentum is

P₁ = m₁v₁ + m₂v₂

= (55 kg)*(0 m/) + (25 kg)*(8 m/s)

= 200 (kg-m)/s

Let V = the speed of Ben and Junior (in an embrace) after the collision.

The final momentum is

P₂ = (m₁ + m₂)V

= (55+25 kg)*(V m/s)

= 80V (kg-m)/s

Equate P₁ and P₂ to obtain

80V = 200

V = 2.5 m/s

Answer: 2.5 m/s

ANSWERED AT 18/11/2019 - 02:04 AM

QUESTION POSTED AT 18/11/2019 - 02:04 AM

### D is at rest at the top of a 2 m high slope. The sled has a mass of 45 kg. The sled's potential energy is J?

**Answer: The sled's potential energy is 882 Joules**

ANSWERED AT 18/11/2019 - 02:04 AM

QUESTION POSTED AT 18/11/2019 - 02:04 AM

### The Bay of Fundy is known for its?

ANSWERED AT 18/11/2019 - 02:02 AM

QUESTION POSTED AT 18/11/2019 - 02:02 AM

### Polyatomic ions bond with other ions to form ionic:

Answer;

Ionic compounds

Polyatomic ions bond with other ions to form ionic compounds.

Explanation;

-Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms.The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.

-Ionic compounds are compounds made up of ions. These ions are atoms that gain or lose electrons, giving them a net positive or negative charge.Metals tend to lose electrons, so they become cations and have a net positive charge. Nonmetals tend to gain electrons, forming anions that have a net negative charge.

ANSWERED AT 18/11/2019 - 01:59 AM

QUESTION POSTED AT 18/11/2019 - 01:59 AM

### It is MOST accurate to say the the body mass index (BMI) provides information about ____________. A. Body composition. B. An individual's height-weight ratio C. Cardiorespitory fitness levels D. An individual's height

**an individual's height-weight ratio.**The correct answer is B.

ANSWERED AT 18/11/2019 - 01:57 AM

QUESTION POSTED AT 18/11/2019 - 01:57 AM