Steam at 100 °C is bubbled into 2.70 kg of water at 25 °C in a calorimeter cup. How much steam will have been added when the water in the cup reaches 55 °C? (Ignore the effect of the cup.)​

What is the ideal mechanical advantage in using a (frictionless) ramp to raise a mass of 9 kg that is at an angle of theta θ = 22 degrees. Explanation needed please. Thank you..

What is the abjective, goal, abstract, and purpose of rotational kinetic energy lab in physics

Global warming has been linked to the growth of population of some insects and pests in cooler areas where they have not been previously seen. What global systems does this population growth affect? Identify a positive and a negative feedback resulting from it.

1) While standing on a stationary skateboard, Sunita catches a heavy ball thrown to her by a friend in the direction that the skateboard is pointing. What is the result of her catching the ball?

A. She begins rolling at the same speed the ball had before she caught it.

B. She begins rolling at a greater speed than the ball had before she caught it.

C. She begins rolling at a lower speed than the ball had before she caught it.

D. She remains stationary after catching the ball.

2)A figure skater performing a spin starts with his arms spread wide and then brings them in close to his body. What is the result?

A. His angular velocity increases, since his moment of inertia decreased.

B. His angular velocity increases, since his moment of inertia increased.

C. His angular velocity decreases, since his moment of inertia decreased.

D. His angular velocity decreases, since his moment of inertia increased.

As a city planner, you receive complaints from local residents about the safety of nearby roads and streets. One complaint concerns a stop sign at the corner of Pine Street and 1st Street. Residents complain that the speed limit in the area (55 mph) is too high to allow vehicles to stop in time. Under normal conditions this is not a problem, but when fog rolls in visibility can reduce to only 155 feet. Since fog is a common occurrence in this region, you decide to investigate. The state highway department states that the effective coefficient of friction between a rolling wheel and asphalt ranges between 0.536 and 0.599, whereas the effective coefficient of friction between a skidding (locked) wheel and asphalt ranges between 0.350 and 0.480. Vehicles of all types travel on the road, from small VW bugs weighing 1150 lb to large trucks weighing 7440 lb. Considering that some drivers will brake properly when slowing down and others will skid to stop, calculate the miminim and maximum braking distance needed to ensure that all vehicles traveling at the posted speed limit can stop before reaching the intersection.

A uniform ladder stands on a rough floor and rests against a frictionless wall as shown in the figure. 2 58 1 Since the floor is rough, it exerts both a normal force N1 and a frictional force f1 on the ladder. However, since the wall is frictionless, it exerts only a normal force N2 on the ladder. The ladder has a length of L = 4.5 m, a weight of WL = 63.5 N, and rests against the wall a distance d = 3.75 m above the floor. If a person with a mass of m = 90 kg is standing on the ladder, determine the following.

(a) the forces exerted on the ladder when the person is halfway up the ladder (Enter the magnitude only.)

N1 = ____ N

N2 = ____ N

f1 = ____ N

(b) the forces exerted on the ladder when the person is three-fourths of the way up the ladder (Enter the magnitude only.)

N1 = ____ N

N2 = ____ N

f1 = ____ N

An green hoop with mass m_h = 2.8 kg and radius R_h = 0.12 m hangs from a string that goes over a blue solid disk pulley with mass m_d = 1.9 kg and radius R_d = 0.09 m. The other end of the string is attached to a massless axel through the center of an orange sphere on a flat horizontal surface that rolls without slipping and has mass m_s = 3.8 kg and radius R_s= 0.22 m. The system is released from rest.

What is magnitude of the linear acceleration of the hoop?

What is magnitude of the linear acceleration of the sphere? '

What is the magnitude of the angular acceleration of the disk pulley?

What is the magnitude of the angular acceleration of the sphere?

What is the tension in the string between the sphere and disk pulley?

What is the tension in the string between the hoop and disk pulley?

The green hoop falls a distance d = 1.69 m. (After being released from rest.) How much time does the hoop take to fall 1.69 m?

What is the magnitude of the velocity of the green hoop after it has dropped 1.69 m?

What is the magnitude of the final angular speed of the orange sphere (after the green hoop has fallen the 1.69 m)?

In the figure, a conducting rod of length L = 29.0 cm moves in a magnetic field B⃗ of magnitude 0.390 T directed into the plane of the figure. The rod moves with speed v = 6.00 m/s in the direction shown.

When the charges in the rod are in equilibrium, what is the magnitude E of the electric field within the rod?

What is the magnitude Vba of the potential difference between the ends of the rod?

What is the magnitude E of the motional emf induced in the rod?

Assume that the firework has a mass of m_0 = 0.30~\text{kg}m​0​​=0.30 kg and is launched from a cannon at an angle of \theta_0 = 41.8^\circθ​0​​=41.8​∘​​ with an initial velocity of | v_0 | = 20~\text{m/s}∣v​0​​∣=20 m/s. Just as the firework reaches its hight point in its trajectory, it explodes into two pieces. Immediately after the explosion, the first piece, with a mass of m_1 = 0.2~\text{kg}m​1​​=0.2 kg flies off at an angle \theta_1 = 150^\circθ​1​​=150​∘​​ relative to the positive (forward) horizontal axis at a velocity of | v_1 | = 5~\text{m/s}∣v​1​​∣=5 m/s relative to the ground. Calculate the trajectory angle, \theta_2θ​2​​ of the second piece immediately after the explosion. Assume the second piece has a mass of m_2 = 0.1~\text{kg}m​2​​=0.1 kg, neglect the effect of air resistance, and report your result as an angle relative to the positive (forward) horizontal axis.

An ice cube whose mass is 50 g is taken from a freezer at a temperature of -10C and then dropped into a cup of water at 0C. If no heat is gained or lost from the outside, how much water will freeze onto the cup?

The tires of a car make 77 revolutions as the car reduces its speed uniformly from 92.0 km/h to 60.0 km/h. The tires have a diameter of 0.84 m.

1. What was the angular acceleration of the tires?

2. If the car continues to decelerate at this rate, how much more time is required for it to stop?

3. If the car continues to decelerate at this rate, how far does it go? Find the total distance.

Consider an electron in a hydrogen atom in the n=2,l=0 state. At what radius ( in units of a0) is the electron most likely to be found?

A particle of mass 4.00 kg is attached to a spring with a force constant of 300 N/m. It is oscillating on a horizontal frictionless surface with an amplitude of 5.00 m. A 9.00 kg object is dropped vertically on top of the 4.00 kg object as it passes through its equilibrium point. The two objects stick together.

a) By how much does the amplitude of the vibrating system change as a result of collision?

b) By how much does the period change?

c) By how much does the energy change?

What are some threshold concepts in Electricity and Magnetism Physics? Use the characteristics of threshold concepts to support your reasoning.