A wooden plank of length 240 cm lies on the edge of a crate with one-third of the plank's length hanging over the crate's edge. A cat with a mass of 4.0 kg walks to the very edge just before she tips the plank over. What is the mass of the plank?

Q: A meter stick with a mass of 100 g balances horizontally when a pivot is placed at the middle (on…

A: The Centre of mass of meter stick and unknown mass is at 60cm

Q: A professor's office door is 0.99 mm wide, 2.1 mm high, 4.2 cm thick; has a mass of 28 kg, and…

A: The width of the door is The hight of the door is The thickness of the door is The mass of the door…

Q: A professor's office door is 0.97 m wide, 2.1 m high, 4.2 cm thick; has a mass of 25 kg , and pivots…

A: Given Data : The width of the office door is , w = 0.97 m The height of the office door is , h =…

Q: meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 5.28 g coins stacked…

A:

Q: A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 5.90 g coins…

A: Given:Length of the stick = 1m = 100 cmMass of a coin = 5.90 gPosition of the coins = 17.2 cmBalance…

Q: A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 6.56 g coins…

A: FBD     Given: mass of wins                     m1=m2= 6.56 g                               d1=…

Q: A 5.4 kgkg cat and a 2.5 kgkg bowl of tuna fish are at opposite ends of the 4.0-mm-long seesaw. How…

A: Given: m1= 5.4 kg  m3 = 2.5 kg  L = 4m  m2 = 3.8 kg

Q: A bar weighs 8 N and is 5 m in length. What is the weight needed (M) to balance the bar? Don't…

A:

Q: A 10m beam of mass of 300 kg extends over a ledge. The beam is not  held down but simply rest on the…

A: Length of beam, L = 10 m  Mass of beam , M = 300 kg  Mas of student, m = 60 kg

Q: What torque is produced by the pole-vaulter's left arm through his centre of gravity What torque is…

A: Given that:FL=1000 NFR=2000 NdL=0.50 mdR=1.5 mW=700 N

Q: A bench is made by placing a 3.9 meter long plank on two legs, each 0.36 meters from one of the…

A:

Q: A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 3.81 g coins…

A: In balenced condition force on meter stick. Mg(X3-X2)=mg(X2-X1) Or, M=m(X2-X1)/(X3-X2) Where…

Q: Review Conceptual Example 7 before starting this problem. A uniform plank of length 5.0 m and weight…

A: x=0.79mExplanation:Step 1:Step 2:*(the torque due to plank's weight is counter-clockwise while the…

Q: A ladder leans against a wall as shown below. A hammer is placed on one of the rungs (you can assume…

A: Given:- The length of the ladder =15 m The mass of the ladder = 10kg The inclination of the ladder=…

Q: A 40kg dog and a 30kg cat are sitting on either end of a long board balanced precariously on a pivot…

A:

Q: Three children are trying to balance on a seesaw, which consists of a fulcrum rock, acting as a…

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Q: A professor's office door is 0.91 m wide, 2.0 m high, and 4.0 cm thick; has a mass of 25 kg; and…

A: Given:The dimension of the door are 0.91m wide 2.0 m high and 4.0 cm thick.The door has a mass of 25…

Q: The figure shows a lower leg being exercised. It has a 49-N weight attached to the foot and is…

A:

Q: A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 3.38 g coins…

A: Initially, without any mass stacked on it, the meter stick is balanced at the 50 cm mark. So this is…

Q: A child with a mass of 24.3 kg sits on a see-saw, 2.75 m from its center (on its fulcrum). How far…

A:

Q: A 20 kg child and a 30 kg child are sitting on an 4 m long see-saw. Where should the fulcrum be…

A:

Q: If mass of box is 50 kg,force P =100 N, and coefficient of friction =0.3,Does the box will tip or…

A:

Q: A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 57.5-gram…

A: The expression for find mass of meter stick is m'=l'cm-llcm-l'cmm Here, m is mass of meter stick,…

Q: (a) Choose the following values. None of them can be 0. Numbers can be picked by expert  The length…

A: Note: As per the guidelines, we can only answer three subparts of a question. Sorry for the…

Q: Two people are sitting on either side of a seesaw. One has mass m and is sitting x meters from the…

A:

Q: In the figure, a 74 kg man walks out on a 20 kg beam that rests on, but is not attached to, two…

A:

Q: A 100 N uniform beam with a length of 3.0 m and supported at the middle is in equilibrium. What is…

A: The torque is given by the product of force and the perpendicular distance.

Q: A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 3.29 g coins…

A: M1 = M2 = 3.29 g  X1 = 50 cm.  X2= X3= 35.8 cm  Xcm = 47.6 cm

Q: Consider the image shown where a plank rests horizontally on a roof.Given the following parameters:…

A:

Q: A 2 m steel rod is hinged as shown. The net torque (in N.m) exerted by the two forces on the rod…

A: It is required to find the net torque due to the forces. For this, it is required to calculate the…

Q: To get up on the roof, a person (mass 70.0 kg) places a 6.00-m aluminum ladder (mass 10.0 kg)…

A: It is given that, m1=70 kgm=10 kgl1=4 ml2=3 ml=6 mg=9.8 m/s2

Q: To get up on the roof, a person (mass 70.0 kg) places a 6.00 m aluminum ladder (mass 10.0 kg)…

A: Given data: M=70.0 kg m=10.0 kg l=6 m x=2 m xcm=2m X=3 m where, M is the Mass of the person m Mass…

Q: A 2.00-m-long, 500 kg steel uniform beam extends horizontally from the point where it has been…

A:

Q: m long. He places one end on the ground 3.0 m from a wall, rests the upper end against a cracked…

A:

Q: A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 58.0-gram…

A: ? - mass of the meter stick, ? = 58 gramLengths ?1 and ?2 can be found as:?1 = 39.2 − 22.5 =16.7…

Q: To get up on the roof, a person (mass 62.0 kg) places a 6.80 m aluminum ladder (mass 11.0 kg)…

A:

Q: Ant-Man is walking around on top of a wooden plank that rests atop two thin, vertical steel pillars,…

A: Given data- Ant man mass m1=80.0 kg The plank mass is m2=11.7 kg length of plank L=2.44 m The…

Q: To get up on the roof, a person (mass 82.0 kg) places a 6.60 m aluminum ladder (mass 11.0 kg)…

A:

Q: Review Conceptual Example 7 before starting this problem. A uniform plank of length 5.0 m and weight…

A:

Q: The 3.8 m long board shown in the image has a mass of 6.4 kg. The left support is 0.40 m from left…

A: Given: Mass of board = 6.4 kg Length of board = 3.8 m Length between right support and right edge =…

Q: A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 6.35 g coins…

A:

Q: A wood plank has a length of 4.2 m an

A: Given: Length of wood plank is L=4.2m Mass of wood plank is m=14.3kg distance d1=3.2m Mass of…

Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics. 

Equilibrium of Forces

The tension created on one body during push or pull is known as force.